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Jimenez-Cyrus D, Adusumilli VS, Stempel MH, Maday S, Ming GL, Song H, Bond AM. Molecular cascade reveals sequential milestones underlying hippocampal neural stem cell development into an adult state. Cell Rep 2024; 43:114339. [PMID: 38852158 DOI: 10.1016/j.celrep.2024.114339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2023] [Revised: 04/16/2024] [Accepted: 05/23/2024] [Indexed: 06/11/2024] Open
Abstract
Quiescent adult neural stem cells (NSCs) in the mammalian brain arise from proliferating NSCs during development. Beyond acquisition of quiescence, an adult NSC hallmark, little is known about the process, milestones, and mechanisms underlying the transition of developmental NSCs to an adult NSC state. Here, we performed targeted single-cell RNA-seq analysis to reveal the molecular cascade underlying NSC development in the early postnatal mouse dentate gyrus. We identified two sequential steps, first a transition to quiescence followed by further maturation, each of which involved distinct changes in metabolic gene expression. Direct metabolic analysis uncovered distinct milestones, including an autophagy burst before NSC quiescence acquisition and cellular reactive oxygen species level elevation along NSC maturation. Functionally, autophagy is important for the NSC transition to quiescence during early postnatal development. Together, our study reveals a multi-step process with defined milestones underlying establishment of the adult NSC pool in the mammalian brain.
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Affiliation(s)
- Dennisse Jimenez-Cyrus
- Department of Neuroscience and Mahoney Institute for Neurosciences, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Vijay S Adusumilli
- Department of Neuroscience and Mahoney Institute for Neurosciences, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Max H Stempel
- Department of Neuroscience and Mahoney Institute for Neurosciences, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Sandra Maday
- Department of Neuroscience and Mahoney Institute for Neurosciences, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Guo-Li Ming
- Department of Neuroscience and Mahoney Institute for Neurosciences, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA; Department of Cell and Developmental Biology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA; Institute for Regenerative Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; Department of Psychiatry, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Hongjun Song
- Department of Neuroscience and Mahoney Institute for Neurosciences, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA; Department of Cell and Developmental Biology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA; Institute for Regenerative Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; Department of Neurosurgery, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA; The Epigenetics Institute, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA.
| | - Allison M Bond
- Department of Neuroscience and Mahoney Institute for Neurosciences, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA; Nash Family Department of Neuroscience, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Department of Cell, Developmental and Regenerative Biology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Friedman Brain Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Black Family Stem Cell Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.
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2
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Abstract
Diseases affecting the hair follicle are common in domestic animals, but despite the importance of an intact skin barrier and a fully functional hair coat, knowledge about the detailed morphological features and the diversity of these complex mini-organs are often limited, although mandatory to evaluate skin biopsies with a history of alopecia. The factors that regulate the innate hair follicle formation and the postnatal hair cycle are still not completely understood in rodents, only rudimentarily known in humans, and are poorly understood in our companion animals. This review aims to summarize the current knowledge about hair follicle and hair shaft anatomy, the arrangement of hair follicles, hair follicle morphogenesis in the embryo, and the lifelong regeneration during the postnatal hair cycle in domestic animals. The role of follicular stem cells and the need for a multitude of interacting signaling events during hair follicle morphogenesis and regeneration is unquestioned. Because of the lack of state of the art methods that can be applied in rodents but are not feasible in companion animals, most of the information in this review is based on rodent studies. However, the few data from domestic animals that are available will be discussed, and it can be assumed that at least the principal molecular mechanisms are similar in rodents and other species.
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3
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Creff J, Nowosad A, Prel A, Pizzoccaro A, Aguirrebengoa M, Duquesnes N, Callot C, Jungas T, Dozier C, Besson A. p57 Kip2 acts as a transcriptional corepressor to regulate intestinal stem cell fate and proliferation. Cell Rep 2023; 42:112659. [PMID: 37327110 DOI: 10.1016/j.celrep.2023.112659] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 12/01/2022] [Accepted: 06/01/2023] [Indexed: 06/18/2023] Open
Abstract
p57Kip2 is a cyclin/CDK inhibitor and a negative regulator of cell proliferation. Here, we report that p57 regulates intestinal stem cell (ISC) fate and proliferation in a CDK-independent manner during intestinal development. In the absence of p57, intestinal crypts exhibit an increased proliferation and an amplification of transit-amplifying cells and of Hopx+ ISCs, which are no longer quiescent, while Lgr5+ ISCs are unaffected. RNA sequencing (RNA-seq) analyses of Hopx+ ISCs show major gene expression changes in the absence of p57. We found that p57 binds to and inhibits the activity of Ascl2, a transcription factor critical for ISC specification and maintenance, by participating in the recruitment of a corepressor complex to Ascl2 target gene promoters. Thus, our data suggest that, during intestinal development, p57 plays a key role in maintaining Hopx+ ISC quiescence and repressing the ISC phenotype outside of the crypt bottom by inhibiting the transcription factor Ascl2 in a CDK-independent manner.
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Affiliation(s)
- Justine Creff
- Molecular, Cellular and Developmental Biology Department (MCD), Centre de Biologie Intégrative (CBI), University of Toulouse, CNRS, UPS, 31062 Toulouse, France
| | - Ada Nowosad
- Molecular, Cellular and Developmental Biology Department (MCD), Centre de Biologie Intégrative (CBI), University of Toulouse, CNRS, UPS, 31062 Toulouse, France
| | - Anne Prel
- Molecular, Cellular and Developmental Biology Department (MCD), Centre de Biologie Intégrative (CBI), University of Toulouse, CNRS, UPS, 31062 Toulouse, France
| | - Anne Pizzoccaro
- Molecular, Cellular and Developmental Biology Department (MCD), Centre de Biologie Intégrative (CBI), University of Toulouse, CNRS, UPS, 31062 Toulouse, France
| | - Marion Aguirrebengoa
- Molecular, Cellular and Developmental Biology Department (MCD), Centre de Biologie Intégrative (CBI), University of Toulouse, CNRS, UPS, 31062 Toulouse, France
| | - Nicolas Duquesnes
- Molecular, Cellular and Developmental Biology Department (MCD), Centre de Biologie Intégrative (CBI), University of Toulouse, CNRS, UPS, 31062 Toulouse, France
| | - Caroline Callot
- Molecular, Cellular and Developmental Biology Department (MCD), Centre de Biologie Intégrative (CBI), University of Toulouse, CNRS, UPS, 31062 Toulouse, France
| | - Thomas Jungas
- Molecular, Cellular and Developmental Biology Department (MCD), Centre de Biologie Intégrative (CBI), University of Toulouse, CNRS, UPS, 31062 Toulouse, France
| | - Christine Dozier
- Molecular, Cellular and Developmental Biology Department (MCD), Centre de Biologie Intégrative (CBI), University of Toulouse, CNRS, UPS, 31062 Toulouse, France
| | - Arnaud Besson
- Molecular, Cellular and Developmental Biology Department (MCD), Centre de Biologie Intégrative (CBI), University of Toulouse, CNRS, UPS, 31062 Toulouse, France.
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4
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Bourque J, Kousnetsov R, Hawiger D. Roles of Hopx in the differentiation and functions of immune cells. Eur J Cell Biol 2022; 101:151242. [DOI: 10.1016/j.ejcb.2022.151242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 05/20/2022] [Accepted: 05/20/2022] [Indexed: 11/03/2022] Open
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5
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HOPX: A Unique Homeodomain Protein in Development and Tumor Suppression. Cancers (Basel) 2022; 14:cancers14112764. [PMID: 35681746 PMCID: PMC9179269 DOI: 10.3390/cancers14112764] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 05/25/2022] [Accepted: 05/30/2022] [Indexed: 12/05/2022] Open
Abstract
Simple Summary Homeobox (HOX) genes encode homeodomain proteins that regulate a wide range of molecular pathways. The homeodomain is highly conserved and binds to DNA. One exception is homeodomain-only protein (HOPX) that lacks DNA-binding capacity. HOPX plays a crucial role in development and its functional impairment is associated with a variety of diseases, including cancer. Loss of HOPX function occurs in a wide range of cancer types, where it functions as a tumor suppressor gene. Understanding the molecular mechanisms by which HOPX regulates carcinogenesis will likely lead to the development of new therapeutic approaches. Abstract Homeobox genes are master regulators of morphogenesis and differentiation by acting at the top of genetic hierarchies and their deregulation is associated with a variety of human diseases. They usually contain a highly conserved sequence that codes for the homeodomain of the protein, a specialized motif with three α helices and an N-terminal arm that aids in DNA binding. However, one homeodomain protein, HOPX, is unique among its family members in that it lacks the capacity to bind DNA and instead functions by interacting with transcriptional regulators. HOPX plays crucial roles in organogenesis and is expressed in both embryonic and adult stem cells. Loss of HOPX expression is common in cancer, where it functions primarily as a tumor suppressor gene. In this review, we describe the function of HOPX in development and discuss its role in carcinogenesis.
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6
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Dmitrieva-Posocco O, Wong AC, Lundgren P, Golos AM, Descamps HC, Dohnalová L, Cramer Z, Tian Y, Yueh B, Eskiocak O, Egervari G, Lan Y, Liu J, Fan J, Kim J, Madhu B, Schneider KM, Khoziainova S, Andreeva N, Wang Q, Li N, Furth EE, Bailis W, Kelsen JR, Hamilton KE, Kaestner KH, Berger SL, Epstein JA, Jain R, Li M, Beyaz S, Lengner CJ, Katona BW, Grivennikov SI, Thaiss CA, Levy M. β-Hydroxybutyrate suppresses colorectal cancer. Nature 2022; 605:160-165. [PMID: 35477756 PMCID: PMC9448510 DOI: 10.1038/s41586-022-04649-6] [Citation(s) in RCA: 124] [Impact Index Per Article: 62.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Accepted: 03/16/2022] [Indexed: 11/08/2022]
Abstract
Colorectal cancer (CRC) is among the most frequent forms of cancer, and new strategies for its prevention and therapy are urgently needed1. Here we identify a metabolite signalling pathway that provides actionable insights towards this goal. We perform a dietary screen in autochthonous animal models of CRC and find that ketogenic diets exhibit a strong tumour-inhibitory effect. These properties of ketogenic diets are recapitulated by the ketone body β-hydroxybutyrate (BHB), which reduces the proliferation of colonic crypt cells and potently suppresses intestinal tumour growth. We find that BHB acts through the surface receptor Hcar2 and induces the transcriptional regulator Hopx, thereby altering gene expression and inhibiting cell proliferation. Cancer organoid assays and single-cell RNA sequencing of biopsies from patients with CRC provide evidence that elevated BHB levels and active HOPX are associated with reduced intestinal epithelial proliferation in humans. This study thus identifies a BHB-triggered pathway regulating intestinal tumorigenesis and indicates that oral or systemic interventions with a single metabolite may complement current prevention and treatment strategies for CRC.
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Affiliation(s)
- Oxana Dmitrieva-Posocco
- Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Andrea C Wong
- Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Patrick Lundgren
- Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Aleksandra M Golos
- Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Hélène C Descamps
- Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Lenka Dohnalová
- Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Zvi Cramer
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Yuhua Tian
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Brian Yueh
- Cold Spring Harbor Laboratory, Cold Spring Harbor, NY, USA
| | - Onur Eskiocak
- Cold Spring Harbor Laboratory, Cold Spring Harbor, NY, USA
| | - Gabor Egervari
- Department of Cell and Developmental Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Yemin Lan
- Department of Cell and Developmental Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Jinping Liu
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Institute for Diabetes, Obesity and Metabolism, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Jiaxin Fan
- Department of Biostatistics Epidemiology and Informatics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Jihee Kim
- Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Bhoomi Madhu
- Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Kai Markus Schneider
- Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Svetlana Khoziainova
- Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Cancer Prevention and Control Program, Fox Chase Cancer Center, Philadelphia, PA, USA
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, CA, USA
- Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA, USA
| | - Natalia Andreeva
- Cancer Prevention and Control Program, Fox Chase Cancer Center, Philadelphia, PA, USA
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, CA, USA
- Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA, USA
| | - Qiaohong Wang
- Department of Cell and Developmental Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Ning Li
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Emma E Furth
- Department of Pathology, University of Pennsylvania Medical Center, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Will Bailis
- Department of Pathology, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Judith R Kelsen
- Division of Gastroenterology, Hepatology and Nutrition, Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Kathryn E Hamilton
- Division of Gastroenterology, Hepatology and Nutrition, Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Klaus H Kaestner
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Institute for Diabetes, Obesity and Metabolism, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Shelley L Berger
- Department of Cell and Developmental Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Jonathan A Epstein
- Department of Cell and Developmental Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Rajan Jain
- Department of Cell and Developmental Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Mingyao Li
- Department of Biostatistics Epidemiology and Informatics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Semir Beyaz
- Cold Spring Harbor Laboratory, Cold Spring Harbor, NY, USA
| | - Christopher J Lengner
- Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Bryson W Katona
- Division of Gastroenterology, Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Sergei I Grivennikov
- Cancer Prevention and Control Program, Fox Chase Cancer Center, Philadelphia, PA, USA
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, CA, USA
- Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, CA, USA
| | - Christoph A Thaiss
- Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
- Institute for Diabetes, Obesity and Metabolism, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
- Institute for Immunology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
| | - Maayan Levy
- Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
- Institute for Immunology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
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7
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Muhammad K, Xavier D, Klein-Hessling S, Azeem M, Rauschenberger T, Murti K, Avots A, Goebeler M, Klein M, Bopp T, Sielaff M, Tenzer S, Möckel S, Aramburu J, López-Rodríguez C, Kerstan A, Serfling E. NFAT5 Controls the Integrity of Epidermis. Front Immunol 2021; 12:780727. [PMID: 34956208 PMCID: PMC8696207 DOI: 10.3389/fimmu.2021.780727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Accepted: 11/15/2021] [Indexed: 11/13/2022] Open
Abstract
The skin protects the human body against dehydration and harmful challenges. Keratinocytes (KCs) are the most abundant epidermal cells, and it is anticipated that KC-mediated transport of Na+ ions creates a physiological barrier of high osmolality against the external environment. Here, we studied the role of NFAT5, a transcription factor whose activity is controlled by osmotic stress in KCs. Cultured KCs from adult mice were found to secrete more than 300 proteins, and upon NFAT5 ablation, the secretion of several matrix proteinases, including metalloproteinase-3 (Mmp3) and kallikrein-related peptidase 7 (Klk7), was markedly enhanced. An increase in Mmp3 and Klk7 RNA levels was also detected in transcriptomes of Nfat5-/- KCs, along with increases of numerous members of the 'Epidermal Differentiation Complex' (EDC), such as small proline-rich (Sprr) and S100 proteins. NFAT5 and Mmp3 as well as NFAT5 and Klk7 are co-expressed in the basal KCs of fetal and adult epidermis but not in basal KCs of newborn (NB) mice. The poor NFAT5 expression in NB KCs is correlated with a strong increase in Mmp3 and Klk7 expression in KCs of NB mice. These data suggests that, along with the fragile epidermis of adult Nfat5-/- mice, NFAT5 keeps in check the expression of matrix proteases in epidermis. The NFAT5-mediated control of matrix proteases in epidermis contributes to the manifold changes in skin development in embryos before and during birth, and to the integrity of epidermis in adults.
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Affiliation(s)
- Khalid Muhammad
- Department of Molecular Pathology, Institute of Pathology, University of Wuerzburg, Wuerzburg, Germany
| | - Delicia Xavier
- Department of Molecular Pathology, Institute of Pathology, University of Wuerzburg, Wuerzburg, Germany
| | - Stefan Klein-Hessling
- Department of Molecular Pathology, Institute of Pathology, University of Wuerzburg, Wuerzburg, Germany.,Comprehensive Cancer Centre Mainfranken, Wuerzburg, Germany
| | - Muhammad Azeem
- Department of Molecular Pathology, Institute of Pathology, University of Wuerzburg, Wuerzburg, Germany.,Department of Dermatology, Venereology and Allergology, University Hospital Wuerzburg, Wuerzburg, Germany
| | - Tabea Rauschenberger
- Department of Molecular Pathology, Institute of Pathology, University of Wuerzburg, Wuerzburg, Germany
| | - Krisna Murti
- Department of Molecular Pathology, Institute of Pathology, University of Wuerzburg, Wuerzburg, Germany
| | - Andris Avots
- Department of Molecular Pathology, Institute of Pathology, University of Wuerzburg, Wuerzburg, Germany.,Comprehensive Cancer Centre Mainfranken, Wuerzburg, Germany
| | - Matthias Goebeler
- Department of Dermatology, Venereology and Allergology, University Hospital Wuerzburg, Wuerzburg, Germany
| | - Matthias Klein
- Institute for Immunology, University Medical Center, University of Mainz, Mainz, Germany
| | - Tobias Bopp
- Institute for Immunology, University Medical Center, University of Mainz, Mainz, Germany.,Research Center for Immunotherapy, University Medical Center, University of Mainz, Mainz, Germany.,University Cancer Center Mainz, University Medical Center, University of Mainz, Mainz, Germany
| | - Malte Sielaff
- Institute for Immunology, University Medical Center, University of Mainz, Mainz, Germany
| | - Stefan Tenzer
- Institute for Immunology, University Medical Center, University of Mainz, Mainz, Germany
| | - Sigrid Möckel
- Institute of Pathology, University of Wuerzburg, Wuerzburg, Germany
| | - José Aramburu
- Immunology Unit, Department of Experimental and Health Sciences, Universitat Pompeu Fabra, Barcelona, Spain
| | - Cristina López-Rodríguez
- Immunology Unit, Department of Experimental and Health Sciences, Universitat Pompeu Fabra, Barcelona, Spain
| | - Andreas Kerstan
- Department of Dermatology, Venereology and Allergology, University Hospital Wuerzburg, Wuerzburg, Germany
| | - Edgar Serfling
- Department of Molecular Pathology, Institute of Pathology, University of Wuerzburg, Wuerzburg, Germany.,Comprehensive Cancer Centre Mainfranken, Wuerzburg, Germany
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8
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Bourque J, Opejin A, Surnov A, Iberg CA, Gross C, Jain R, Epstein JA, Hawiger D. Landscape of Hopx expression in cells of the immune system. Heliyon 2021; 7:e08311. [PMID: 34805566 PMCID: PMC8590040 DOI: 10.1016/j.heliyon.2021.e08311] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Revised: 09/30/2021] [Accepted: 10/29/2021] [Indexed: 11/29/2022] Open
Abstract
Homeodomain only protein (Hopx) is a regulator of cell differentiation and function, and it has also emerged as a crucial marker of specific developmental and differentiation potentials. Hopx expression and functions have been identified in some stem cells, tumors, and in certain immune cells. However, expression of Hopx in immune cells remains insufficiently characterized. Here we report a comprehensive pattern of Hopx expression in multiple types of immune cells under steady state conditions. By utilizing single-cell RNA sequencing (scRNA-seq) and flow cytometric analysis, we characterize a constitutive expression of Hopx in specific subsets of CD4+ and CD8+ T cells and B cells, as well as natural killer (NK), NKT, and myeloid cells. In contrast, Hopx expression is not present in conventional dendritic cells and eosinophils. The utility of identifying expression of Hopx in immune cells may prove vital in delineating specific roles of Hopx under multiple immune conditions.
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Affiliation(s)
- Jessica Bourque
- Department of Molecular Microbiology and Immunology, Saint Louis University School of Medicine, St. Louis, MO 63118, USA
| | - Adeleye Opejin
- Department of Molecular Microbiology and Immunology, Saint Louis University School of Medicine, St. Louis, MO 63118, USA
| | - Alexey Surnov
- Department of Molecular Microbiology and Immunology, Saint Louis University School of Medicine, St. Louis, MO 63118, USA
| | - Courtney A Iberg
- Department of Molecular Microbiology and Immunology, Saint Louis University School of Medicine, St. Louis, MO 63118, USA
| | - Cindy Gross
- Department of Molecular Microbiology and Immunology, Saint Louis University School of Medicine, St. Louis, MO 63118, USA
| | - Rajan Jain
- Department of Medicine, Cardiovascular Institute, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - Jonathan A Epstein
- Department of Medicine, Cardiovascular Institute, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - Daniel Hawiger
- Department of Molecular Microbiology and Immunology, Saint Louis University School of Medicine, St. Louis, MO 63118, USA
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9
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Caetano AJ, Yianni V, Volponi A, Booth V, D'Agostino EM, Sharpe P. Defining human mesenchymal and epithelial heterogeneity in response to oral inflammatory disease. eLife 2021; 10:62810. [PMID: 33393902 PMCID: PMC7781605 DOI: 10.7554/elife.62810] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Accepted: 12/19/2020] [Indexed: 12/12/2022] Open
Abstract
Human oral soft tissues provide the first barrier of defence against chronic inflammatory disease and hold a remarkable scarless wounding phenotype. Tissue homeostasis requires coordinated actions of epithelial, mesenchymal, and immune cells. However, the extent of heterogeneity within the human oral mucosa and how tissue cell types are affected during the course of disease progression is unknown. Using single-cell transcriptome profiling we reveal a striking remodelling of the epithelial and mesenchymal niches with a decrease in functional populations that are linked to the aetiology of the disease. Analysis of ligand–receptor interaction pairs identify potential intercellular hubs driving the inflammatory component of the disease. Our work establishes a reference map of the human oral mucosa in health and disease, and a framework for the development of new therapeutic strategies.
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Affiliation(s)
- Ana J Caetano
- Centre for Craniofacial and Regenerative Biology, Faculty of Dentistry, Oral & Craniofacial Sciences, King's College London, London, United Kingdom
| | - Val Yianni
- Centre for Craniofacial and Regenerative Biology, Faculty of Dentistry, Oral & Craniofacial Sciences, King's College London, London, United Kingdom
| | - Ana Volponi
- Centre for Craniofacial and Regenerative Biology, Faculty of Dentistry, Oral & Craniofacial Sciences, King's College London, London, United Kingdom
| | - Veronica Booth
- Department of Periodontology, Faculty of Dentistry, Oral & Craniofacial Sciences, King's College London, London, United Kingdom
| | - Eleanor M D'Agostino
- Unilever R&D, Colworth Science Park, Sharnbrook, Bedfordshire, Bedford, United Kingdom
| | - Paul Sharpe
- Centre for Craniofacial and Regenerative Biology, Faculty of Dentistry, Oral & Craniofacial Sciences, King's College London, London, United Kingdom
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10
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Lee SA, Li KN, Tumbar T. Stem cell-intrinsic mechanisms regulating adult hair follicle homeostasis. Exp Dermatol 2020; 30:430-447. [PMID: 33278851 DOI: 10.1111/exd.14251] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Revised: 11/23/2020] [Accepted: 11/24/2020] [Indexed: 12/12/2022]
Abstract
Adult hair follicle stem cells (HFSCs) undergo dynamic and periodic molecular changes in their cellular states throughout the hair homeostatic cycle. These states are tightly regulated by cell-intrinsic mechanisms and by extrinsic signals from the microenvironment. HFSCs are essential not only for fuelling hair growth, but also for skin wound healing. Increasing evidence suggests an important role of HFSCs in organizing multiple skin components around the hair follicle, thus functioning as an organizing centre during adult skin homeostasis. Here, we focus on recent findings on cell-intrinsic mechanisms of HFSC homeostasis, which include transcription factors, histone modifications, DNA regulatory elements, non-coding RNAs, cell metabolism, cell polarity and post-transcriptional mRNA processing. Several transcription factors are now known to participate in well-known signalling pathways that control hair follicle homeostasis, as well as in super-enhancer activities to modulate HFSC and progenitor lineage progression. Interestingly, HFSCs have been shown to secrete molecules that are important in guiding the organization of several skin components around the hair follicle, including nerves, arrector pili muscle and vasculature. Finally, we discuss recent technological advances in the field such as single-cell RNA sequencing and live imaging, which revealed HFSC and progenitor heterogeneity and brought new light to understanding crosstalking between HFSCs and the microenvironment. The field is well on its way to generate a comprehensive map of molecular interactions that should serve as a solid theoretical platform for application in hair and skin disease and ageing.
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Affiliation(s)
- Seon A Lee
- Molecular Biology and Genetics, Cornell University, Ithaca, NY, USA
| | - Kefei Nina Li
- Molecular Biology and Genetics, Cornell University, Ithaca, NY, USA
| | - Tudorita Tumbar
- Molecular Biology and Genetics, Cornell University, Ithaca, NY, USA
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11
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The role of HOPX in normal tissues and tumor progression. Biosci Rep 2020; 40:221873. [PMID: 31934721 PMCID: PMC6997107 DOI: 10.1042/bsr20191953] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Revised: 12/03/2019] [Accepted: 12/23/2019] [Indexed: 02/06/2023] Open
Abstract
The homeodomain-only protein homeobox (HOPX) as the smallest homeodomain protein, lacks certain conserved residues required for DNA binding. Through our literature search, we reviewed the current understandings of HOPX in normal tissues and tumor progression. HOPX was initially identified as a critical transcription factor in various normal tissues, which interacted with serum response factor (SRF) or other substance to regulate normal physiological function. However, HOPX is at a low expression or methylation level in tumors. These data indicated that HOPX may play a very important role in regulating differentiation phenotype and tumor suppressive function. We predicted the prognosis of HOPX in tumors from TCGA database and discussed the downstream genes of HOPX. To understand how HOPX is involved in the mechanisms between physical and pathological conditions could lead to novel therapeutic strategies for treatment.
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12
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Opejin A, Surnov A, Misulovin Z, Pherson M, Gross C, Iberg CA, Fallahee I, Bourque J, Dorsett D, Hawiger D. A Two-Step Process of Effector Programming Governs CD4 + T Cell Fate Determination Induced by Antigenic Activation in the Steady State. Cell Rep 2020; 33:108424. [PMID: 33238127 PMCID: PMC7714042 DOI: 10.1016/j.celrep.2020.108424] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Revised: 10/01/2020] [Accepted: 10/30/2020] [Indexed: 02/06/2023] Open
Abstract
Various processes induce and maintain immune tolerance, but effector T cells still arise under minimal perturbations of homeostasis through unclear mechanisms. We report that, contrary to the model postulating primarily tolerogenic mechanisms initiated under homeostatic conditions, effector programming is an integral part of T cell fate determination induced by antigenic activation in the steady state. This effector programming depends on a two-step process starting with induction of effector precursors that express Hopx and are imprinted with multiple instructions for their subsequent terminal effector differentiation. Such molecular circuits advancing specific terminal effector differentiation upon re-stimulation include programmed expression of interferon-γ, whose production then promotes expression of T-bet in the precursors. We further show that effector programming coincides with regulatory conversion among T cells sharing the same antigen specificity. However, conventional type 2 dendritic cells (cDC2) and T cell functions of mammalian target of rapamycin complex 1 (mTORC1) increase effector precursor induction while decreasing the proportion of T cells that can become peripheral Foxp3+ regulatory T (pTreg) cells. The mechanisms in the steady state that govern the formation of effector T cells with potentially autoimmune functions remain unclear. Opejin et al. reveal a two-step process starting with induction of effector precursors that express Hopx and are imprinted with multiple instructions for their subsequent terminal effector differentiation.
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Affiliation(s)
- Adeleye Opejin
- Department of Molecular Microbiology and Immunology, Saint Louis University School of Medicine, St. Louis, MO, USA
| | - Alexey Surnov
- Department of Molecular Microbiology and Immunology, Saint Louis University School of Medicine, St. Louis, MO, USA
| | - Ziva Misulovin
- Edward A. Doisy Department of Biochemistry and Molecular Biology, Saint Louis University School of Medicine, St. Louis, MO, USA
| | - Michelle Pherson
- Edward A. Doisy Department of Biochemistry and Molecular Biology, Saint Louis University School of Medicine, St. Louis, MO, USA
| | - Cindy Gross
- Department of Molecular Microbiology and Immunology, Saint Louis University School of Medicine, St. Louis, MO, USA
| | - Courtney A Iberg
- Department of Molecular Microbiology and Immunology, Saint Louis University School of Medicine, St. Louis, MO, USA
| | - Ian Fallahee
- Department of Molecular Microbiology and Immunology, Saint Louis University School of Medicine, St. Louis, MO, USA
| | - Jessica Bourque
- Department of Molecular Microbiology and Immunology, Saint Louis University School of Medicine, St. Louis, MO, USA
| | - Dale Dorsett
- Edward A. Doisy Department of Biochemistry and Molecular Biology, Saint Louis University School of Medicine, St. Louis, MO, USA
| | - Daniel Hawiger
- Department of Molecular Microbiology and Immunology, Saint Louis University School of Medicine, St. Louis, MO, USA.
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13
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Paris AJ, Hayer KE, Oved JH, Avgousti DC, Toulmin SA, Zepp JA, Zacharias WJ, Katzen JB, Basil MC, Kremp MM, Slamowitz AR, Jayachandran S, Sivakumar A, Dai N, Wang P, Frank DB, Eisenlohr LC, Cantu E, Beers MF, Weitzman MD, Morrisey EE, Worthen GS. STAT3-BDNF-TrkB signalling promotes alveolar epithelial regeneration after lung injury. Nat Cell Biol 2020; 22:1197-1210. [PMID: 32989251 PMCID: PMC8167437 DOI: 10.1038/s41556-020-0569-x] [Citation(s) in RCA: 51] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Accepted: 08/03/2020] [Indexed: 01/13/2023]
Abstract
Alveolar epithelial regeneration is essential for recovery from devastating lung diseases. This process occurs when type II alveolar pneumocytes (AT2 cells) proliferate and transdifferentiate into type I alveolar pneumocytes (AT1 cells). We used genome-wide analysis of chromatin accessibility and gene expression following acute lung injury to elucidate repair mechanisms. AT2 chromatin accessibility changed substantially following injury to reveal STAT3 binding motifs adjacent to genes that regulate essential regenerative pathways. Single-cell transcriptome analysis identified brain-derived neurotrophic factor (Bdnf) as a STAT3 target gene with newly accessible chromatin in a unique population of regenerating AT2 cells. Furthermore, the BDNF receptor tropomyosin receptor kinase B (TrkB) was enriched on mesenchymal alveolar niche cells (MANCs). Loss or blockade of AT2-specific Stat3, Bdnf or mesenchyme-specific TrkB compromised repair and reduced Fgf7 expression by niche cells. A TrkB agonist improved outcomes in vivo following lung injury. These data highlight the biological and therapeutic importance of the STAT3-BDNF-TrkB axis in orchestrating alveolar epithelial regeneration.
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Affiliation(s)
- Andrew J Paris
- Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Katharina E Hayer
- Department of Biomedical and Health Informatics, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Joseph H Oved
- Division of Hematology, Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Daphne C Avgousti
- Division of Human Biology, Fred Hutchinson Cancer Research Center, Seattle, WA, USA
| | - Sushila A Toulmin
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Jarod A Zepp
- Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Penn-CHOP Lung Biology Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - William J Zacharias
- Division of Pulmonary Biology, Perinatal Institute, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, USA
| | - Jeremy B Katzen
- Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Penn-CHOP Lung Biology Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Maria C Basil
- Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Penn-CHOP Lung Biology Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Madison M Kremp
- Penn-CHOP Lung Biology Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | | | - Sowmya Jayachandran
- Division of Cardiology, Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Aravind Sivakumar
- Division of Cardiology, Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Ning Dai
- Division of Neonatology, Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Ping Wang
- Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - David B Frank
- Penn-CHOP Lung Biology Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Division of Cardiology, Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Laurence C Eisenlohr
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Division of Protective Immunity, Department of Pathology and Laboratory Medicine, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Edward Cantu
- Division of Cardiovascular Surgery, Department of Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Michael F Beers
- Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Penn-CHOP Lung Biology Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Matthew D Weitzman
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Division of Protective Immunity, Department of Pathology and Laboratory Medicine, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Edward E Morrisey
- Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Penn-CHOP Lung Biology Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Penn Cardiovascular Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Penn Institute for Regenerative Medicine, Perelman School of Medicine, Philadelphia, PA, USA
- Department of Cell and Developmental Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - G Scott Worthen
- Penn-CHOP Lung Biology Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
- Division of Neonatology, Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
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14
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HOPX regulates bone marrow-derived mesenchymal stromal cell fate determination via suppression of adipogenic gene pathways. Sci Rep 2020; 10:11345. [PMID: 32647304 PMCID: PMC7347885 DOI: 10.1038/s41598-020-68261-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Accepted: 06/22/2020] [Indexed: 01/08/2023] Open
Abstract
Previous studies of global binding patterns identified the epigenetic factor, EZH2, as a regulator of the homeodomain-only protein homeobox (HOPX) gene expression during bone marrow stromal cell (BMSC) differentiation, suggesting a potential role for HOPX in regulating BMSC lineage specification. In the present study, we confirmed that EZH2 direct binds to the HOPX promoter region, during normal growth and osteogenic differentiation but not under adipogenic inductive conditions. HOPX gene knockdown and overexpression studies demonstrated that HOPX is a promoter of BMSC proliferation and an inhibitor of adipogenesis. However, functional studies failed to observe any affect by HOPX on BMSC osteogenic differentiation. RNA-seq analysis of HOPX overexpressing BMSC during adipogenesis, found HOPX function to be acting through suppression of adipogenic pathways associated genes such as ADIPOQ, FABP4, PLIN1 and PLIN4. These findings suggest that HOPX gene target pathways are critical factors in the regulation of fat metabolism.
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15
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Wang Z, Nan W, Si H, Wang S, Zhang H, Li G. Pantothenic acid promotes dermal papilla cell proliferation in hair follicles of American minks via inhibitor of DNA Binding 3/Notch signaling pathway. Life Sci 2020; 252:117667. [PMID: 32304761 DOI: 10.1016/j.lfs.2020.117667] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2019] [Revised: 03/31/2020] [Accepted: 04/09/2020] [Indexed: 11/18/2022]
Abstract
AIMS Pantothenic acid (PA) has been applied to treat alopecia, but the underlying mechanism is still unclear. Our study aims to explore the underlying mechanism of PA in regulating hair follicle (HF) growth. MAIN METHODS Mink HFs and dermal papilla (DP) cells were isolated and cultured in vitro. HFs and DP cells were treated with 0, 10, 20, 40 μg/ml PA. The effect of PA on HF growth, DP cell proliferation, cell cycle distribution, cell migration, and insulin-like growth factor-1 (IGF-1) and vascular endothelial growth factor (VEGF) expressions in DP cells was measured. Moreover, the effect of PA on inhibitor of DNA binding 3 (ID3)/Notch signaling pathway was analyzed. Subsequently, ID3 was silenced to validate whether ID3/Notch signaling pathway was involved in regulating DP cell proliferation by PA. KEY FINDINGS Both 20 μg/ml and 40 μg/ml PA promoted HF growth, G1/S transition of DP cells and IGF-1 and VEGF expressions in DP cells, while only 20 μg/ml PA promoted cell viability and the migration of DP cells. Thus 20 μg/ml PA was chosen for the following experiments. PA treatment was found to up-regulate ID3 expression but down-regulate Notch receptor 1 (Notch1) and Notch signaling targets expressions. Furthermore, ID3 knockdown reversed PA-induced cell proliferation and inhibition of Notch1 and Notch signaling targets expressions, indicating that PA-induced DP cell proliferation and inhibition of Notch signaling were mediated via up-regulation of ID3. SIGNIFICANCE This study provides an underlying mechanism related to the effect of PA on stimulating DP cell proliferation.
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Affiliation(s)
- Zhuo Wang
- Institute of Special Animal and Plant Sciences, Chinese Academy of Agricultural Sciences, Changchun, Jilin 130112, People's Republic of China
| | - Weixiao Nan
- Institute of Special Animal and Plant Sciences, Chinese Academy of Agricultural Sciences, Changchun, Jilin 130112, People's Republic of China
| | - Huazhe Si
- Institute of Special Animal and Plant Sciences, Chinese Academy of Agricultural Sciences, Changchun, Jilin 130112, People's Republic of China
| | - Shiyong Wang
- Institute of Laboratory Animal Science, Guizhou University of Traditional Chinese Medicine, Guiyang, Guizhou 550025, People's Republic of China
| | - Haihua Zhang
- College of Animal Science and Technology, Hebei Normal University of Science and Technology, Qinhuangdao, Hebei 066004, People's Republic of China.
| | - Guangyu Li
- Institute of Special Animal and Plant Sciences, Chinese Academy of Agricultural Sciences, Changchun, Jilin 130112, People's Republic of China.
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16
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Lin CC, Yao CY, Hsu YC, Hou HA, Yuan CT, Li YH, Kao CJ, Chuang PH, Chiu YC, Chen Y, Chou WC, Tien HF. Knock-out of Hopx disrupts stemness and quiescence of hematopoietic stem cells in mice. Oncogene 2020; 39:5112-5123. [PMID: 32533098 DOI: 10.1038/s41388-020-1340-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 05/18/2020] [Accepted: 05/27/2020] [Indexed: 02/06/2023]
Abstract
HOPX is a stem cell marker in hair follicles and intestines. It was shown critical for primitive hematopoiesis. We previously showed an association between higher HOPX expression and clinical characteristics related to stemness and quiescence of leukemic cells in acute myeloid leukemia (AML) patients. To further explore its physiologic functions in hematopoietic system, we generated a mouse model with hematopoietic cell-specific knockout of Hopx (Hopx-/-). In young Hopx-/- mice, the hematopoietic stem cells (HSC) showed decreased reconstitution ability after serial transplantation. Further transcriptomic study revealed decreased HSC signatures in long-term HSCs from the Hopx-/- mice. At 18 months of age, half of the Hopx-/- mice developed cytopenia and splenomegaly. Bone marrow (BM) from the sick mice showed myeloid hyperplasia with predominant mature neutrophils, and decreased progenitor cells and lymphocytes. These phenotypes suggested critical functions of Hopx in maintaining HSC quiescence. Transcriptomic study of the Hopx-/- marrow cells showed significant downregulation of the Cxcl12-Cxcr4 axis, which is critical for maintenance of HSC quiescence. We next examined the role of Hopx in AML by using the MN1 overexpression murine leukemia model. Mice transplanted with MN1-overexpressed Hopx-/- BM cells developed AML with more aggressive phenotypes compared with those transplanted with MN1-overexpressed Hopx-wild cells. Hopx-/- MN1-overexpressed leukemia cells showed higher proliferation rate and downregulation of Cxcl12 and Cxcr4. Furthermore, in human AML, BM plasma CXCL12 levels were lower in patients with lower HOPX expression. In conclusion, our study highlights the roles of Hopx in maintenance of quiescence of the hematopoietic stem cells through CXCL12 pathway in vivo and provides implication of this protein in normal and malignant hematopoiesis.
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Affiliation(s)
- Chien-Chin Lin
- Department of Laboratory Medicine, National Taiwan University Hospital, Taipei, Taiwan.,Division of Hematology, Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan.,Graduate Institute of Clinical Medicine, National Taiwan University, Taipei, Taiwan
| | - Chi-Yuan Yao
- Department of Laboratory Medicine, National Taiwan University Hospital, Taipei, Taiwan.,Division of Hematology, Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan
| | - Yueh-Chwen Hsu
- Department of Laboratory Medicine, National Taiwan University Hospital, Taipei, Taiwan
| | - Hsin-An Hou
- Division of Hematology, Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan
| | - Chang-Tsu Yuan
- Graduate Institute of Clinical Medicine, National Taiwan University, Taipei, Taiwan.,Department of Pathology, Graduate Institute of Oncology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Yi-Hung Li
- Department of Animal Science, Chinese Culture University, Taipei, Taiwan
| | - Chein-Jun Kao
- Division of Hematology, Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan
| | - Po-Han Chuang
- Division of Hematology, Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan
| | - Yu-Chiao Chiu
- Greehey Children's Cancer Research Institute, University of Texas Health Science Center at San Antonio, San Antonio, TX, 78229, USA
| | - Yidong Chen
- Greehey Children's Cancer Research Institute, University of Texas Health Science Center at San Antonio, San Antonio, TX, 78229, USA
| | - Wen-Chien Chou
- Department of Laboratory Medicine, National Taiwan University Hospital, Taipei, Taiwan. .,Division of Hematology, Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan.
| | - Hwei-Fang Tien
- Division of Hematology, Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan.
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17
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Parasram K, Karpowicz P. Time after time: circadian clock regulation of intestinal stem cells. Cell Mol Life Sci 2020; 77:1267-1288. [PMID: 31586240 PMCID: PMC11105114 DOI: 10.1007/s00018-019-03323-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Revised: 09/16/2019] [Accepted: 09/25/2019] [Indexed: 12/22/2022]
Abstract
Daily fluctuations in animal physiology, known as circadian rhythms, are orchestrated by a conserved molecular timekeeper, known as the circadian clock. The circadian clock forms a transcription-translation feedback loop that has emerged as a central biological regulator of many 24-h processes. Early studies of the intestine discovered that many digestive functions have a daily rhythm and that intestinal cell production was similarly time-dependent. As genetic methods in model organisms have become available, it has become apparent that the circadian clock regulates many basic cellular functions, including growth, proliferation, and differentiation, as well as cell signalling and stem cell self-renewal. Recent connections between circadian rhythms and immune system function, and between circadian rhythms and microbiome dynamics, have also been revealed in the intestine. These processes are highly relevant in understanding intestinal stem cell biology. Here we describe the circadian clock regulation of intestinal stem cells primarily in two model organisms: Drosophila melanogaster and mice. Like all cells in the body, intestinal stem cells are subject to circadian timing, and both cell-intrinsic and cell-extrinsic circadian processes contribute to their function.
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Affiliation(s)
- Kathyani Parasram
- Department of Biological Sciences, University of Windsor, 401 Sunset Avenue, Windsor, ON, N9B 3P4, Canada
| | - Phillip Karpowicz
- Department of Biological Sciences, University of Windsor, 401 Sunset Avenue, Windsor, ON, N9B 3P4, Canada.
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18
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Wang Y, Chiang IL, Ohara TE, Fujii S, Cheng J, Muegge BD, Ver Heul A, Han ND, Lu Q, Xiong S, Chen F, Lai CW, Janova H, Wu R, Whitehurst CE, VanDussen KL, Liu TC, Gordon JI, Sibley LD, Stappenbeck TS. Long-Term Culture Captures Injury-Repair Cycles of Colonic Stem Cells. Cell 2019; 179:1144-1159.e15. [PMID: 31708126 PMCID: PMC6904908 DOI: 10.1016/j.cell.2019.10.015] [Citation(s) in RCA: 114] [Impact Index Per Article: 22.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Revised: 07/15/2019] [Accepted: 10/16/2019] [Indexed: 02/07/2023]
Abstract
The colonic epithelium can undergo multiple rounds of damage and repair, often in response to excessive inflammation. The responsive stem cell that mediates this process is unclear, in part because of a lack of in vitro models that recapitulate key epithelial changes that occur in vivo during damage and repair. Here, we identify a Hopx+ colitis-associated regenerative stem cell (CARSC) population that functionally contributes to mucosal repair in mouse models of colitis. Hopx+ CARSCs, enriched for fetal-like markers, transiently arose from hypertrophic crypts known to facilitate regeneration. Importantly, we established a long-term, self-organizing two-dimensional (2D) epithelial monolayer system to model the regenerative properties and responses of Hopx+ CARSCs. This system can reenact the "homeostasis-injury-regeneration" cycles of epithelial alterations that occur in vivo. Using this system, we found that hypoxia and endoplasmic reticulum stress, insults commonly present in inflammatory bowel diseases, mediated the cyclic switch of cellular status in this process.
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Affiliation(s)
- Yi Wang
- Department of Pathology and Immunology, Washington University School of Medicine, Saint Louis, MO 63110, USA
| | - I-Ling Chiang
- Department of Pathology and Immunology, Washington University School of Medicine, Saint Louis, MO 63110, USA
| | - Takahiro E Ohara
- Department of Pathology and Immunology, Washington University School of Medicine, Saint Louis, MO 63110, USA
| | - Satoru Fujii
- Department of Pathology and Immunology, Washington University School of Medicine, Saint Louis, MO 63110, USA
| | - Jiye Cheng
- Department of Pathology and Immunology, Washington University School of Medicine, Saint Louis, MO 63110, USA; The Edison Family Center for Genome Sciences and Systems Biology, Washington University School of Medicine, Saint Louis, MO 63110, USA
| | - Brian D Muegge
- Department of Pathology and Immunology, Washington University School of Medicine, Saint Louis, MO 63110, USA
| | - Aaron Ver Heul
- Department of Pathology and Immunology, Washington University School of Medicine, Saint Louis, MO 63110, USA
| | - Nathan D Han
- Department of Pathology and Immunology, Washington University School of Medicine, Saint Louis, MO 63110, USA; The Edison Family Center for Genome Sciences and Systems Biology, Washington University School of Medicine, Saint Louis, MO 63110, USA
| | - Qiuhe Lu
- Department of Pathology and Immunology, Washington University School of Medicine, Saint Louis, MO 63110, USA
| | - Shanshan Xiong
- Department of Pathology and Immunology, Washington University School of Medicine, Saint Louis, MO 63110, USA
| | - Feidi Chen
- Department of Pathology and Immunology, Washington University School of Medicine, Saint Louis, MO 63110, USA
| | - Chin-Wen Lai
- Department of Pathology and Immunology, Washington University School of Medicine, Saint Louis, MO 63110, USA
| | - Hana Janova
- Department of Pathology and Immunology, Washington University School of Medicine, Saint Louis, MO 63110, USA
| | - Renee Wu
- Department of Pathology and Immunology, Washington University School of Medicine, Saint Louis, MO 63110, USA
| | - Charles E Whitehurst
- Boehringer Ingelheim Pharmaceuticals, Immunology and Respiratory Disease Research, Ridgefield, CT 06877, USA
| | - Kelli L VanDussen
- Department of Pathology and Immunology, Washington University School of Medicine, Saint Louis, MO 63110, USA
| | - Ta-Chiang Liu
- Department of Pathology and Immunology, Washington University School of Medicine, Saint Louis, MO 63110, USA
| | - Jeffrey I Gordon
- Department of Pathology and Immunology, Washington University School of Medicine, Saint Louis, MO 63110, USA; The Edison Family Center for Genome Sciences and Systems Biology, Washington University School of Medicine, Saint Louis, MO 63110, USA
| | - L David Sibley
- Department of Molecular Microbiology, Washington University School of Medicine, Saint Louis, MO 63110, USA
| | - Thaddeus S Stappenbeck
- Department of Pathology and Immunology, Washington University School of Medicine, Saint Louis, MO 63110, USA.
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19
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Abstract
Nearly one-third of adults over the age of 65 have lost all their teeth. We set out to understand tooth renewal in animals that have replacement and regeneration capabilities. Using cichlid fishes and mouse models, we discovered plasticity between tooth and taste bud progenitor cell derivatives, mediated by BMP. Our results suggest that oral organs have surprising regenerative capabilities and can be manipulated to express characteristics of different tissue types. In Lake Malawi cichlids, each tooth is replaced in one-for-one fashion every ∼20 to 50 d, and taste buds (TBs) are continuously renewed as in mammals. These structures are colocalized in the fish mouth and throat, from the point of initiation through adulthood. Here, we found that replacement teeth (RT) share a continuous band of epithelium with adjacent TBs and that both organs coexpress stem cell factors in subsets of label-retaining cells. We used RNA-seq to characterize transcriptomes of RT germs and TB-bearing oral epithelium. Analysis revealed differential usage of developmental pathways in RT compared to TB oral epithelia, as well as a repertoire of genome paralogues expressed complimentarily in each organ. Notably, BMP ligands were expressed in RT but excluded from TBs. Morphant fishes bathed in a BMP chemical antagonist exhibited RT with abrogated shh expression in the inner dental epithelium (IDE) and ectopic expression of calb2 (a TB marker) in these very cells. In the mouse, teeth are located on the jaw margin while TBs and other oral papillae are located on the tongue. Previous study reported that tongue intermolar eminence (IE) oral papillae of Follistatin (a BMP antagonist) mouse mutants exhibited dysmorphic invagination. We used these mutants to demonstrate altered transcriptomes and ectopic expression of dental markers in tongue IE. Our results suggest that vertebrate oral epithelium retains inherent plasticity to form tooth and taste-like cell types, mediated by BMP specification of progenitor cells. These findings indicate underappreciated epithelial cell populations with promising potential in bioengineering and dental therapeutics.
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20
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Berg DA, Su Y, Jimenez-Cyrus D, Patel A, Huang N, Morizet D, Lee S, Shah R, Ringeling FR, Jain R, Epstein JA, Wu QF, Canzar S, Ming GL, Song H, Bond AM. A Common Embryonic Origin of Stem Cells Drives Developmental and Adult Neurogenesis. Cell 2019; 177:654-668.e15. [PMID: 30929900 PMCID: PMC6496946 DOI: 10.1016/j.cell.2019.02.010] [Citation(s) in RCA: 149] [Impact Index Per Article: 29.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Revised: 12/20/2018] [Accepted: 02/08/2019] [Indexed: 02/07/2023]
Abstract
New neurons arise from quiescent adult neural progenitors throughout life in specific regions of the mammalian brain. Little is known about the embryonic origin and establishment of adult neural progenitors. Here, we show that Hopx+ precursors in the mouse dentate neuroepithelium at embryonic day 11.5 give rise to proliferative Hopx+ neural progenitors in the primitive dentate region, and they, in turn, generate granule neurons, but not other neurons, throughout development and then transition into Hopx+ quiescent radial glial-like neural progenitors during an early postnatal period. RNA-seq and ATAC-seq analyses of Hopx+ embryonic, early postnatal, and adult dentate neural progenitors further reveal common molecular and epigenetic signatures and developmental dynamics. Together, our findings support a "continuous" model wherein a common neural progenitor population exclusively contributes to dentate neurogenesis throughout development and adulthood. Adult dentate neurogenesis may therefore represent a lifelong extension of development that maintains heightened plasticity in the mammalian hippocampus.
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Affiliation(s)
- Daniel A Berg
- Department of Neuroscience and Mahoney Institute for Neurosciences, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Yijing Su
- Department of Neuroscience and Mahoney Institute for Neurosciences, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Dennisse Jimenez-Cyrus
- Department of Neuroscience and Mahoney Institute for Neurosciences, University of Pennsylvania, Philadelphia, PA 19104, USA; The Cellular and Molecular Medicine Graduate Program, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Aneek Patel
- Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Nancy Huang
- Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - David Morizet
- Department of Neuroscience and Mahoney Institute for Neurosciences, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Stephanie Lee
- Department of Neuroscience and Mahoney Institute for Neurosciences, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Reeti Shah
- Department of Neuroscience and Mahoney Institute for Neurosciences, University of Pennsylvania, Philadelphia, PA 19104, USA
| | | | - Rajan Jain
- Department of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; Department of Cell and Developmental Biology, University of Pennsylvania, Philadelphia, PA 19104, USA; Institute for Regenerative Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Jonathan A Epstein
- Department of Cell and Developmental Biology, University of Pennsylvania, Philadelphia, PA 19104, USA; Institute for Regenerative Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; The Epigenetics Institute, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Qing-Feng Wu
- State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
| | - Stefan Canzar
- Gene Center, Ludwig-Maximilians-Universität München, 81377 Munich, Germany
| | - Guo-Li Ming
- Department of Neuroscience and Mahoney Institute for Neurosciences, University of Pennsylvania, Philadelphia, PA 19104, USA; Department of Cell and Developmental Biology, University of Pennsylvania, Philadelphia, PA 19104, USA; Institute for Regenerative Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; Department of Psychiatry, University of Pennsylvania, Philadelphia, PA 19104, USA.
| | - Hongjun Song
- Department of Neuroscience and Mahoney Institute for Neurosciences, University of Pennsylvania, Philadelphia, PA 19104, USA; Department of Cell and Developmental Biology, University of Pennsylvania, Philadelphia, PA 19104, USA; Institute for Regenerative Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; The Epigenetics Institute, University of Pennsylvania, Philadelphia, PA 19104, USA.
| | - Allison M Bond
- Department of Neuroscience and Mahoney Institute for Neurosciences, University of Pennsylvania, Philadelphia, PA 19104, USA
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Early lineage specification defines alveolar epithelial ontogeny in the murine lung. Proc Natl Acad Sci U S A 2019; 116:4362-4371. [PMID: 30782824 DOI: 10.1073/pnas.1813952116] [Citation(s) in RCA: 88] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
During the stepwise specification and differentiation of tissue-specific multipotent progenitors, lineage-specific transcriptional networks are activated or repressed to orchestrate cell specification. The gas-exchange niche in the lung contains two major epithelial cell types, alveolar type 1 (AT1) and AT2 cells, and the timing of lineage specification of these cells is critical for the correct formation of this niche and postnatal survival. Integrating cell-specific lineage tracing studies, spatially specific mRNA transcript and protein expression, and single-cell RNA-sequencing analysis, we demonstrate that specification of alveolar epithelial cell fate begins concomitantly with the proximal-distal specification of epithelial progenitors and branching morphogenesis earlier than previously appreciated. By using a newly developed dual-lineage tracing system, we show that bipotent alveolar cells that give rise to AT1 and AT2 cells are a minor contributor to the alveolar epithelial population. Furthermore, single-cell assessment of the transcriptome identifies specified AT1 and AT2 progenitors rather than bipotent cells during sacculation. These data reveal a paradigm of organ formation whereby lineage specification occurs during the nascent stages of development coincident with broad tissue-patterning processes, including axial patterning of the endoderm and branching morphogenesis.
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22
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Wu H, Kirita Y, Donnelly EL, Humphreys BD. Advantages of Single-Nucleus over Single-Cell RNA Sequencing of Adult Kidney: Rare Cell Types and Novel Cell States Revealed in Fibrosis. J Am Soc Nephrol 2018; 30:23-32. [PMID: 30510133 DOI: 10.1681/asn.2018090912] [Citation(s) in RCA: 390] [Impact Index Per Article: 65.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2018] [Accepted: 10/21/2018] [Indexed: 11/03/2022] Open
Abstract
BACKGROUND A challenge for single-cell genomic studies in kidney and other solid tissues is generating a high-quality single-cell suspension that contains rare or difficult-to-dissociate cell types and is free of both RNA degradation and artifactual transcriptional stress responses. METHODS We compared single-cell RNA sequencing (scRNA-seq) using the DropSeq platform with single-nucleus RNA sequencing (snRNA-seq) using sNuc-DropSeq, DroNc-seq, and 10X Chromium platforms on adult mouse kidney. We validated snRNA-seq on fibrotic kidney from mice 14 days after unilateral ureteral obstruction (UUO) surgery. RESULTS A total of 11,391 transcriptomes were generated in the comparison phase. We identified ten clusters in the scRNA-seq dataset, but glomerular cell types were absent, and one cluster consisted primarily of artifactual dissociation-induced stress response genes. By contrast, snRNA-seq from all three platforms captured a diversity of kidney cell types that were not represented in the scRNA-seq dataset, including glomerular podocytes, mesangial cells, and endothelial cells. No stress response genes were detected. Our snRNA-seq protocol yielded 20-fold more podocytes compared with published scRNA-seq datasets (2.4% versus 0.12%, respectively). Unexpectedly, single-cell and single-nucleus platforms had equivalent gene detection sensitivity. For validation, analysis of frozen day 14 UUO kidney revealed rare juxtaglomerular cells, novel activated proximal tubule and fibroblast cell states, and previously unidentified tubulointerstitial signaling pathways. CONCLUSIONS snRNA-seq achieves comparable gene detection to scRNA-seq in adult kidney, and it also has substantial advantages, including reduced dissociation bias, compatibility with frozen samples, elimination of dissociation-induced transcriptional stress responses, and successful performance on inflamed fibrotic kidney.
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Affiliation(s)
- Haojia Wu
- Division of Nephrology, Department of Medicine and
| | - Yuhei Kirita
- Division of Nephrology, Department of Medicine and
| | | | - Benjamin D Humphreys
- Division of Nephrology, Department of Medicine and .,Department of Developmental Biology, Washington University in St. Louis School of Medicine, St. Louis, Missouri
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23
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Yamashita K, Hosoda K, Nishizawa N, Katoh H, Watanabe M. Epigenetic biomarkers of promoter DNA methylation in the new era of cancer treatment. Cancer Sci 2018; 109:3695-3706. [PMID: 30264476 PMCID: PMC6272087 DOI: 10.1111/cas.13812] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Revised: 09/20/2018] [Accepted: 09/22/2018] [Indexed: 12/21/2022] Open
Abstract
Promoter DNA methylation, which occurs on cytosine nucleotides across CpG islands, results in gene silencing and represents a major epigenetic alteration in human cancer. Methylation-specific PCR can amplify these modifications as markers in cancer cells. In the present work, we rigorously review the published literatures describing DNA methylation in the promoters of critical tumor suppressor genes; detection of promoter DNA methylation in various body fluids permits early detection of cancer cells during perioperative courses of clinical treatment. The latest whole-genome comprehensive explorations identified excellent epigenetic biomarkers that could be detected at high frequency with high specificity; these biomarkers, which are designated highly relevant methylation genes (HRMG), permit the discrimination of tumor tissues from the corresponding normal tissues; these markers are also associated with unique cancer phenotypes, including dismal prognosis. In humans, HRMG include the CDO1, GSHR, RASSF1 and SFRP1 genes, with these markers permitting discrimination depending on the organs tested. The combination of several HRMG increased the early detection of cancer and exhibited reliable surveillance potential in human body fluids. Cancer clinics using such epigenetic biomarkers are entering a new era of enhanced decision-making with the potential for improved cancer prognosis.
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Affiliation(s)
- Keishi Yamashita
- SurgeryKitasato University School of MedicineSagamiharaKanagawaJapan
- Division of Advanced Surgical Oncology, Research and Development Center for New Medical FrontiersKitasato University School of MedicineSagamiharaKanagawaJapan
| | - Kei Hosoda
- SurgeryKitasato University School of MedicineSagamiharaKanagawaJapan
| | | | - Hiroshi Katoh
- SurgeryKitasato University School of MedicineSagamiharaKanagawaJapan
| | - Masahiko Watanabe
- SurgeryKitasato University School of MedicineSagamiharaKanagawaJapan
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24
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Flexible fate determination ensures robust differentiation in the hair follicle. Nat Cell Biol 2018; 20:1361-1369. [PMID: 30420661 PMCID: PMC6314017 DOI: 10.1038/s41556-018-0232-y] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Accepted: 10/12/2018] [Indexed: 12/14/2022]
Abstract
Tissue homeostasis is sustained by stem cell self-renewal and differentiation. How stem cells coordinately differentiate into multiple cell types is largely unclear. Recent studies underline the heterogeneity among stem cells or common progenitors, suggesting that coordination occurs at the stem cell/progenitor level1-4. Here, by tracking and manipulating the same stem cells and their progeny at the single-cell level in live mice, we uncover an unanticipated flexibility of homeostatic stem cell differentiation in hair follicles. Although stem cells have been shown to be flexible upon injury, we demonstrate that hair germ stem cells at the single-cell level can flexibly establish all of the differentiation lineages even in uninjured conditions. Furthermore, stem cell-derived hair progenitors in the structure called matrix, previously thought to be unipotent, flexibly change differentiation outcomes as a consequence of unexpected dynamic relocation. Finally, the flexible cell fate determination mechanism maintains normal differentiation and tissue architecture against an ectopic differentiation stimulus induced by Wnt activation. This work provides a model of continual fate channelling and late commitment of stem cells to achieve coordinated differentiation and robust tissue architecture.
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25
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Dynamic expression of HOPX in alveolar epithelial cells reflects injury and repair during the progression of pulmonary fibrosis. Sci Rep 2018; 8:12983. [PMID: 30154568 PMCID: PMC6113210 DOI: 10.1038/s41598-018-31214-x] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Accepted: 08/14/2018] [Indexed: 01/29/2023] Open
Abstract
Mechanisms of injury and repair in alveolar epithelial cells (AECs) are critically involved in the progression of various lung diseases including idiopathic pulmonary fibrosis (IPF). Homeobox only protein x (HOPX) contributes to the formation of distal lung during development. In adult lung, alveolar epithelial type (AT) I cells express HOPX and lineage-labeled Hopx+ cells give rise to both ATI and ATII cells after pneumonectomy. However, the cell function of HOPX-expressing cells in adult fibrotic lung diseases has not been investigated. In this study, we have established a flow cytometry-based method to evaluate HOPX-expressing cells in the lung. HOPX expression in cultured ATII cells increased over culture time, which was accompanied by a decrease of proSP-C, an ATII marker. Moreover, HOPX expression was increased in AECs from bleomycin-instilled mouse lungs in vivo. Small interfering RNA-based knockdown of Hopx resulted in suppressing ATII-ATI trans-differentiation and activating cellular proliferation in vitro. In IPF lungs, HOPX expression was decreased in whole lungs and significantly correlated to a decline in lung function and progression of IPF. In conclusion, HOPX is upregulated during early alveolar injury and repair process in the lung. Decreased HOPX expression might contribute to failed regenerative processes in end-stage IPF lungs.
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26
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Abstract
This review by Jain and Epstein discusses the developmental processes that influence cardiac lineage decisions and cellular competence and advances our understanding of cardiac cell specification, gene regulation, and chromatin organization and how they impact cardiac development. The mature heart is composed primarily of four different cell types: cardiac myocytes, endothelium, smooth muscle, and fibroblasts. These cell types derive from pluripotent progenitors that become progressively restricted with regard to lineage potential, giving rise to multipotent cardiac progenitor cells and, ultimately, the differentiated cell types of the heart. Recent studies have begun to shed light on the defining characteristics of the intermediary cell types that exist transiently during this developmental process and the extrinsic and cell-autonomous factors that influence cardiac lineage decisions and cellular competence. This information will shape our understanding of congenital and adult cardiac disease and guide regenerative therapeutic approaches. In addition, cardiac progenitor specification can serve as a model for understanding basic mechanisms regulating the acquisition of cellular identity. In this review, we present the concept of “chromatin competence” that describes the potential for three-dimensional chromatin organization to function as the molecular underpinning of the ability of a progenitor cell to respond to inductive lineage cues and summarize recent studies advancing our understanding of cardiac cell specification, gene regulation, and chromatin organization and how they impact cardiac development.
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Affiliation(s)
- Rajan Jain
- Department of Medicine, Department of Cell and Developmental Biology, Institute for Regenerative Medicine, Penn Cardiovascular Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Jonathan A Epstein
- Department of Medicine, Department of Cell and Developmental Biology, Institute for Regenerative Medicine, Penn Cardiovascular Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
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27
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Palpant NJ, Wang Y, Hadland B, Zaunbrecher RJ, Redd M, Jones D, Pabon L, Jain R, Epstein J, Ruzzo WL, Zheng Y, Bernstein I, Margolin A, Murry CE. Chromatin and Transcriptional Analysis of Mesoderm Progenitor Cells Identifies HOPX as a Regulator of Primitive Hematopoiesis. Cell Rep 2018; 20:1597-1608. [PMID: 28813672 DOI: 10.1016/j.celrep.2017.07.067] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Revised: 06/05/2017] [Accepted: 07/24/2017] [Indexed: 11/30/2022] Open
Abstract
We analyzed chromatin dynamics and transcriptional activity of human embryonic stem cell (hESC)-derived cardiac progenitor cells (CPCs) and KDR+/CD34+ endothelial cells generated from different mesodermal origins. Using an unbiased algorithm to hierarchically rank genes modulated at the level of chromatin and transcription, we identified candidate regulators of mesodermal lineage determination. HOPX, a non-DNA-binding homeodomain protein, was identified as a candidate regulator of blood-forming endothelial cells. Using HOPX reporter and knockout hESCs, we show that HOPX regulates blood formation. Loss of HOPX does not impact endothelial fate specification but markedly reduces primitive hematopoiesis, acting at least in part through failure to suppress Wnt/β-catenin signaling. Thus, chromatin state analysis permits identification of regulators of mesodermal specification, including a conserved role for HOPX in governing primitive hematopoiesis.
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Affiliation(s)
- Nathan J Palpant
- Department of Pathology, University of Washington School of Medicine, Seattle, WA 98109, USA; Center for Cardiovascular Biology, University of Washington School of Medicine, Seattle, WA 98109, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA.
| | - Yuliang Wang
- Department of Computer Science, University of Washington School of Medicine, Seattle, WA 98109, USA
| | - Brandon Hadland
- Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA
| | - Rebecca J Zaunbrecher
- Department of Bioengineering, University of Washington School of Medicine, Seattle, WA 98109, USA; Center for Cardiovascular Biology, University of Washington School of Medicine, Seattle, WA 98109, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA
| | - Meredith Redd
- Department of Bioengineering, University of Washington School of Medicine, Seattle, WA 98109, USA; Center for Cardiovascular Biology, University of Washington School of Medicine, Seattle, WA 98109, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA
| | - Daniel Jones
- Department of Computer Science, University of Washington School of Medicine, Seattle, WA 98109, USA
| | - Lil Pabon
- Department of Pathology, University of Washington School of Medicine, Seattle, WA 98109, USA; Center for Cardiovascular Biology, University of Washington School of Medicine, Seattle, WA 98109, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA
| | - Rajan Jain
- Department of Cell and Developmental Biology, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Jonathan Epstein
- Department of Cell and Developmental Biology, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Walter L Ruzzo
- Department of Computer Science, University of Washington School of Medicine, Seattle, WA 98109, USA
| | - Ying Zheng
- Department of Bioengineering, University of Washington School of Medicine, Seattle, WA 98109, USA; Center for Cardiovascular Biology, University of Washington School of Medicine, Seattle, WA 98109, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA
| | - Irwin Bernstein
- Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA
| | - Adam Margolin
- Department of Biomedical Engineering, Oregon Health & Science University, Portland, OR 97239, USA
| | - Charles E Murry
- Department of Pathology, University of Washington School of Medicine, Seattle, WA 98109, USA; Department of Bioengineering, University of Washington School of Medicine, Seattle, WA 98109, USA; Department of Medicine/Cardiology, University of Washington School of Medicine, Seattle, WA 98109, USA; Center for Cardiovascular Biology, University of Washington School of Medicine, Seattle, WA 98109, USA; Institute for Stem Cell and Regenerative Medicine, University of Washington School of Medicine, Seattle, WA 98109, USA.
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28
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Zacharias WJ, Frank DB, Zepp JA, Morley MP, Alkhaleel FA, Kong J, Zhou S, Cantu E, Morrisey EE. Regeneration of the lung alveolus by an evolutionarily conserved epithelial progenitor. Nature 2018; 555:251-255. [PMID: 29489752 PMCID: PMC6020060 DOI: 10.1038/nature25786] [Citation(s) in RCA: 430] [Impact Index Per Article: 71.7] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Accepted: 01/24/2018] [Indexed: 12/11/2022]
Abstract
Functional tissue regeneration is required for the restoration of normal organ homeostasis after severe injury. Some organs, such as the intestine, harbour active stem cells throughout homeostasis and regeneration; more quiescent organs, such as the lung, often contain facultative progenitor cells that are recruited after injury to participate in regeneration. Here we show that a Wnt-responsive alveolar epithelial progenitor (AEP) lineage within the alveolar type 2 cell population acts as a major facultative progenitor cell in the distal lung. AEPs are a stable lineage during alveolar homeostasis but expand rapidly to regenerate a large proportion of the alveolar epithelium after acute lung injury. AEPs exhibit a distinct transcriptome, epigenome and functional phenotype and respond specifically to Wnt and Fgf signalling. In contrast to other proposed lung progenitor cells, human AEPs can be directly isolated by expression of the conserved cell surface marker TM4SF1, and act as functional human alveolar epithelial progenitor cells in 3D organoids. Our results identify the AEP lineage as an evolutionarily conserved alveolar progenitor that represents a new target for human lung regeneration strategies.
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Affiliation(s)
- William J Zacharias
- Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.,Penn Center for Pulmonary Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - David B Frank
- Penn Center for Pulmonary Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.,Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania 19104, USA.,Penn Cardiovascular Institute, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Jarod A Zepp
- Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.,Penn Center for Pulmonary Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Michael P Morley
- Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.,Penn Center for Pulmonary Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.,Penn Cardiovascular Institute, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Farrah A Alkhaleel
- Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.,Penn Center for Pulmonary Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Jun Kong
- Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.,Penn Center for Pulmonary Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Su Zhou
- Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.,Penn Cardiovascular Institute, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Edward Cantu
- Department of Surgery, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Edward E Morrisey
- Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.,Penn Center for Pulmonary Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.,Penn Cardiovascular Institute, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.,Department of Cell and Developmental Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.,Penn Institute for Regenerative Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
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29
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The tankyrase inhibitor G007-LK inhibits small intestine LGR5 + stem cell proliferation without altering tissue morphology. Biol Res 2018; 51:3. [PMID: 29316982 PMCID: PMC5759193 DOI: 10.1186/s40659-017-0151-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2017] [Accepted: 12/28/2017] [Indexed: 12/16/2022] Open
Abstract
Background The WNT pathway regulates intestinal stem cells and is frequently disrupted in intestinal adenomas. The pathway contains several potential biotargets for interference, including the poly-ADP ribosyltransferase enzymes tankyrase1 and 2. LGR5 is a known WNT pathway target gene and marker of intestinal stem cells. The LGR5+ stem cells are located in the crypt base and capable of regenerating all intestinal epithelial cell lineages. Results We treated Lgr5-EGFP-Ires-CreERT2;R26R-Confetti mice with the tankyrase inhibitor G007-LK for up to 3 weeks to assess the effect on duodenal stem cell homeostasis and on the integrity of intestinal epithelium. At the administered doses, G007-LK treatment inhibited WNT signalling in LGR5+ stem cells and reduced the number and distribution of cells traced from duodenal LGR5+ stem cells. However, the gross morphology of the duodenum remained unaltered and G007-LK-treated mice showed no signs of weight loss or any other visible morphological changes. The inhibitory effect on LGR5+ stem cell proliferation was reversible. Conclusion We show that the tankyrase inhibitor G007-LK is well tolerated by the mice, although proliferation of the LGR5+ intestinal stem cells was inhibited. Our observations suggest the presence of a tankyrase inhibitor-resistant cell population in the duodenum, able to rescue tissue integrity in the presence of G007-LK-mediated inhibition of the WNT signalling dependent LGR5+ intestinal epithelial stem cells. Electronic supplementary material The online version of this article (10.1186/s40659-017-0151-6) contains supplementary material, which is available to authorized users.
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30
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Guerrero-Juarez CF, Astrowski AA, Murad R, Dang CT, Shatrova VO, Astrowskaja A, Lim CH, Ramos R, Wang X, Liu Y, Lee HL, Pham KT, Hsi TC, Oh JW, Crocker D, Mortazavi A, Ito M, Plikus MV. Wound Regeneration Deficit in Rats Correlates with Low Morphogenetic Potential and Distinct Transcriptome Profile of Epidermis. J Invest Dermatol 2018; 138:1409-1419. [PMID: 29317265 DOI: 10.1016/j.jid.2017.12.030] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Revised: 12/14/2017] [Accepted: 12/22/2017] [Indexed: 01/10/2023]
Abstract
Large excisional wounds in mice prominently regenerate new hair follicles (HFs) and fat, yet humans are deficient for this regenerative behavior. Currently, wound-induced regeneration remains a clinically desirable, but only partially understood phenomenon. We show that large excisional wounds in rats across seven strains fail to regenerate new HFs. We compared wound transcriptomes between mice and rats at the time of scab detachment, which coincides with the onset of HF regeneration in mice. In both species, wound dermis and epidermis share core dermal and epidermal transcriptional programs, respectively, yet prominent interspecies differences exist. Compared with mice, rat epidermis expresses distinct transcriptional and epigenetic factors, markers of epidermal repair, hyperplasia, and inflammation, and lower levels of WNT signaling effectors and regulators. When recombined on the surface of excisional wounds with vibrissa dermal papillae, partial-thickness skin grafts containing distal pelage HF segments, but not interfollicular epidermis, readily regenerated new vibrissa-like HFs. Together, our findings establish rats as a nonregenerating rodent model for excisional wound healing and suggest that low epidermal competence and associated transcriptional profile may contribute to its regenerative deficiency. Future comparison between rat and mouse may lend further insight into the mechanism of wounding-induced regeneration and causes for its deficit.
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Affiliation(s)
- Christian F Guerrero-Juarez
- Department of Developmental and Cell Biology, University of California, Irvine, Irvine, California, USA; Sue and Bill Gross Stem Cell Research Center, University of California, Irvine, Irvine, California, USA; Center for Complex Biological Systems, University of California, Irvine, Irvine, California, USA
| | - Aliaksandr A Astrowski
- Department of Medical Biology and Genetics, Grodna State Medical University, Grodna, Belarus
| | - Rabi Murad
- Department of Developmental and Cell Biology, University of California, Irvine, Irvine, California, USA; Center for Complex Biological Systems, University of California, Irvine, Irvine, California, USA
| | - Christina T Dang
- Department of Developmental and Cell Biology, University of California, Irvine, Irvine, California, USA; Sue and Bill Gross Stem Cell Research Center, University of California, Irvine, Irvine, California, USA
| | - Vera O Shatrova
- Department of Medical Biology and Genetics, Grodna State Medical University, Grodna, Belarus
| | - Aksana Astrowskaja
- Department of Medical Biology and Genetics, Grodna State Medical University, Grodna, Belarus
| | - Chae Ho Lim
- The Ronald O. Perelman Department of Dermatology, Department of Cell Biology, New York University School of Medicine, New York, New York, USA
| | - Raul Ramos
- Department of Developmental and Cell Biology, University of California, Irvine, Irvine, California, USA; Sue and Bill Gross Stem Cell Research Center, University of California, Irvine, Irvine, California, USA; Center for Complex Biological Systems, University of California, Irvine, Irvine, California, USA
| | - Xiaojie Wang
- Department of Developmental and Cell Biology, University of California, Irvine, Irvine, California, USA; Sue and Bill Gross Stem Cell Research Center, University of California, Irvine, Irvine, California, USA; Center for Complex Biological Systems, University of California, Irvine, Irvine, California, USA
| | - Yuchen Liu
- Department of Developmental and Cell Biology, University of California, Irvine, Irvine, California, USA; Sue and Bill Gross Stem Cell Research Center, University of California, Irvine, Irvine, California, USA
| | - Hye-Lim Lee
- Department of Developmental and Cell Biology, University of California, Irvine, Irvine, California, USA; Sue and Bill Gross Stem Cell Research Center, University of California, Irvine, Irvine, California, USA
| | - Kim T Pham
- Department of Developmental and Cell Biology, University of California, Irvine, Irvine, California, USA; Sue and Bill Gross Stem Cell Research Center, University of California, Irvine, Irvine, California, USA
| | - Tsai-Ching Hsi
- Department of Developmental and Cell Biology, University of California, Irvine, Irvine, California, USA; Sue and Bill Gross Stem Cell Research Center, University of California, Irvine, Irvine, California, USA
| | - Ji Won Oh
- Department of Developmental and Cell Biology, University of California, Irvine, Irvine, California, USA; Sue and Bill Gross Stem Cell Research Center, University of California, Irvine, Irvine, California, USA; Department of Anatomy, School of Medicine, Kyungpook National University, Daegu, Republic of Korea; Biomedical Research Institute, Kyungpook National University Hospital, Daegu, Republic of Korea; Hair Transplantation Center, Kyungpook National University Hospital, Daegu, Republic of Korea
| | - Daniel Crocker
- Department of Biology, Sonoma State University, Rohnert Park, California, USA
| | - Ali Mortazavi
- Department of Developmental and Cell Biology, University of California, Irvine, Irvine, California, USA; Center for Complex Biological Systems, University of California, Irvine, Irvine, California, USA
| | - Mayumi Ito
- The Ronald O. Perelman Department of Dermatology, Department of Cell Biology, New York University School of Medicine, New York, New York, USA
| | - Maksim V Plikus
- Department of Developmental and Cell Biology, University of California, Irvine, Irvine, California, USA; Sue and Bill Gross Stem Cell Research Center, University of California, Irvine, Irvine, California, USA; Center for Complex Biological Systems, University of California, Irvine, Irvine, California, USA.
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31
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Huang WY, Lai SF, Chiu HY, Chang M, Plikus MV, Chan CC, Chen YT, Tsao PN, Yang TL, Lee HS, Chi P, Lin SJ. Mobilizing Transit-Amplifying Cell-Derived Ectopic Progenitors Prevents Hair Loss from Chemotherapy or Radiation Therapy. Cancer Res 2017; 77:6083-6096. [PMID: 28939680 DOI: 10.1158/0008-5472.can-17-0667] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2017] [Revised: 08/02/2017] [Accepted: 09/14/2017] [Indexed: 12/15/2022]
Abstract
Genotoxicity-induced hair loss from chemotherapy and radiotherapy is often encountered in cancer treatment, and there is a lack of effective treatment. In growing hair follicles (HF), quiescent stem cells (SC) are maintained in the bulge region, and hair bulbs at the base contain rapidly dividing, yet genotoxicity-sensitive transit-amplifying cells (TAC) that maintain hair growth. How genotoxicity-induced HF injury is repaired remains unclear. We report here that HFs mobilize ectopic progenitors from distinct TAC compartments for regeneration in adaptation to the severity of dystrophy induced by ionizing radiation (IR). Specifically, after low-dose IR, keratin 5+ basal hair bulb progenitors, rather than bulge SCs, were quickly activated to replenish matrix cells and regenerated all concentric layers of HFs, demonstrating their plasticity. After high-dose IR, when both matrix and hair bulb cells were depleted, the surviving outer root sheath cells rapidly acquired an SC-like state and fueled HF regeneration. Their progeny then homed back to SC niche and supported new cycles of HF growth. We also revealed that IR induced HF dystrophy and hair loss and suppressed WNT signaling in a p53- and dose-dependent manner. Augmenting WNT signaling attenuated the suppressive effect of p53 and enhanced ectopic progenitor proliferation after genotoxic injury, thereby preventing both IR- and cyclophosphamide-induced alopecia. Hence, targeted activation of TAC-derived progenitor cells, rather than quiescent bulge SCs, for anagen HF repair can be a potential approach to prevent hair loss from chemotherapy and radiotherapy. Cancer Res; 77(22); 6083-96. ©2017 AACR.
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Affiliation(s)
- Wen-Yen Huang
- Institute of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan University, Taipei, Taiwan
| | - Shih-Fan Lai
- Institute of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan University, Taipei, Taiwan.,Division of Radiation Oncology, Department of Oncology, National Taiwan University Hospital and College of Medicine, Taipei, Taiwan
| | - Hsien-Yi Chiu
- Institute of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan University, Taipei, Taiwan.,Department of Dermatology, Hsin-Chu Branch, National Taiwan University Hospital, Hsin-Chu City, Taiwan.,Department of Dermatology, National Taiwan University Hospital and College of Medicine, Taipei, Taiwan
| | - Michael Chang
- Sophie Davis School of Biomedical Education, City University of New York, New York, New York
| | - Maksim V Plikus
- Department of Developmental and Cell Biology, Sue and Bill Gross Stem Cell Research Center and Center for Complex Biological Systems, University of California, Irvine, Irvine, California
| | - Chih-Chieh Chan
- Department of Dermatology, National Taiwan University Hospital and College of Medicine, Taipei, Taiwan
| | - You-Tzung Chen
- Institute of Medical Genomics and Proteomics, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Po-Nien Tsao
- Department of Pediatrics, National Taiwan University Hospital and College of Medicine, Taipei, Taiwan.,Research Center for Developmental Biology and Regenerative Medicine, National Taiwan University, Taipei, Taiwan
| | - Tsung-Lin Yang
- Research Center for Developmental Biology and Regenerative Medicine, National Taiwan University, Taipei, Taiwan.,Department of Otolaryngology, National Taiwan University Hospital and College of Medicine, Taipei, Taiwan.,Graduate Institute of Clinical Medicine, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Hsuan-Shu Lee
- Department of Internal Medicine, National Taiwan University Hospital and College of Medicine, Taipei, Taiwan.,Institute of Biotechnology, National Taiwan University, Taipei, Taiwan
| | - Peter Chi
- Institute of Biochemical Sciences, College of Life Science, National Taiwan University, Taipei, Taiwan.,Institute of Biological Chemistry, Academia Sinica, Taipei, Taiwan
| | - Sung-Jan Lin
- Institute of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan University, Taipei, Taiwan. .,Department of Dermatology, National Taiwan University Hospital and College of Medicine, Taipei, Taiwan.,Research Center for Developmental Biology and Regenerative Medicine, National Taiwan University, Taipei, Taiwan.,Graduate Institute of Clinical Medicine, National Taiwan University College of Medicine, Taipei, Taiwan
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32
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Pathophysiology and therapeutic potential of cardiac fibrosis. Inflamm Regen 2017; 37:13. [PMID: 29259712 PMCID: PMC5725925 DOI: 10.1186/s41232-017-0046-5] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Accepted: 03/28/2017] [Indexed: 12/24/2022] Open
Abstract
Inflammatory and fibrotic responses to myocardial damage are essential for cardiac repair; however, these responses often result in extensive fibrotic remodeling with impaired systolic function. Recent reports have suggested that such acute phase responses provide a favorable environment for endogenous cardiac regeneration, which is mainly driven by the division of pre-existing cardiomyocytes (CMs). Existing CMs in mammals can re-acquire proliferative activity after substantial cardiac damage, and elements other than CMs in the physiological and/or pathological environment, such as hypoxia, angiogenesis, and the polarity of infiltrating macrophages, have been reported to regulate replication. Cardiac fibroblasts comprise the largest cell population in terms of cell number in the myocardium, and they play crucial roles in the proliferation and protection of CMs. The in vivo direct reprogramming of functional CMs has been investigated in cardiac regeneration. Currently, growth factors, transcription factors, microRNAs, and small molecules promoting the regeneration and protection of these CMs have also been actively researched. Here, we summarize and discuss current studies on the relationship between cardiac inflammation and fibrosis, and cardiac regeneration and protection, which would be useful for the development of therapeutic strategies to treat and prevent advanced heart failure.
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33
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Shinin VV, Panteleyev AA. Targeting of Stem Cell Niches Using Unconventional Genetic Tools. J Invest Dermatol 2017. [PMID: 28647027 DOI: 10.1016/j.jid.2017.03.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Maintenance of hair follicle (HF) stem cell quiescence and self-renewal are key functions of a specific cellular niche represented by the HF bulge and adjacent cell populations. The unique context of this niche is crucial for normal HF functioning, but mechanisms implicated in its maintenance are still not quite clear. The Letter to the Editor by Sada et al. introduces a novel Slc1a3-CreER genetic mouse model which, in contrast to previously reported marking tools, selectively and highly efficiently demarcates the telogen bulge inner layer, one of the critical structural components of the bulge stem cell niche. The successful use of this tool identified the inner root sheath as a cellular source of telogen bulge inner layer and suggested its potential for further endeavors into fundamental and applied aspects of HF stem cell biology and club hair formation.
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34
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Lin CC, Hsu YC, Li YH, Kuo YY, Hou HA, Lan KH, Chen TC, Tzeng YS, Kuo YY, Kao CJ, Chuang PH, Tseng MH, Chiu YC, Chou WC, Tien HF. Higher HOPX expression is associated with distinct clinical and biological features and predicts poor prognosis in de novo acute myeloid leukemia. Haematologica 2017; 102:1044-1053. [PMID: 28341738 PMCID: PMC5451336 DOI: 10.3324/haematol.2016.161257] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Accepted: 03/17/2017] [Indexed: 01/29/2023] Open
Abstract
Homeodomain-only protein homeobox (HOPX) is the smallest homeodomain protein. It was regarded as a stem cell marker in several non-hematopoietic systems. While the prototypic homeobox genes such as the HOX family have been well characterized in acute myeloid leukemia (AML), the clinical and biological implications of HOPX in the disease remain unknown. Thus we analyzed HOPX and global gene expression patterns in 347 newly diagnosed de novo AML patients in our institute. We found that higher HOPX expression was closely associated with older age, higher platelet counts, lower white blood cell counts, lower lactate dehydrogenase levels, and mutations in RUNX1, IDH2, ASXL1, and DNMT3A, but negatively associated with acute promyelocytic leukemia, favorable karyotypes, CEBPA double mutations and NPM1 mutation. Patients with higher HOPX expression had a lower complete remission rate and shorter survival. The finding was validated in two independent cohorts. Multivariate analysis revealed that higher HOPX expression was an independent unfavorable prognostic factor irrespective of other known prognostic parameters and gene signatures derived from multiple cohorts. Gene set enrichment analysis showed higher HOPX expression was associated with both hematopoietic and leukemia stem cell signatures. While HOPX and HOX family genes showed concordant expression patterns in normal hematopoietic stem/progenitor cells, their expression patterns and associated clinical and biological features were distinctive in AML settings, demonstrating HOPX to be a unique homeobox gene. Therefore, HOPX is a distinctive homeobox gene with characteristic clinical and biological implications and its expression is a powerful predictor of prognosis in AML patients.
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Affiliation(s)
- Chien-Chin Lin
- Department of Laboratory Medicine, National Taiwan University, Taipei, Taiwan.,Division of Hematology and Department of Internal Medicine, National Taiwan University, Taipei, Taiwan.,Graduate Institute of Clinical Medicine, National Taiwan University, Taipei, Taiwan
| | - Yueh-Chwen Hsu
- Graduate Institute of Clinical Medicine, National Taiwan University, Taipei, Taiwan
| | - Yi-Hung Li
- Division of Hematology and Department of Internal Medicine, National Taiwan University, Taipei, Taiwan
| | - Yuan-Yeh Kuo
- Graduate Institute of Oncology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Hsin-An Hou
- Division of Hematology and Department of Internal Medicine, National Taiwan University, Taipei, Taiwan
| | - Keng-Hsueh Lan
- Division of Radiation Oncology and Department of Oncology, National Taiwan University, Taipei, Taiwan
| | - Tsung-Chih Chen
- Division of Hematology and Department of Internal Medicine, National Taiwan University, Taipei, Taiwan
| | - Yi-Shiuan Tzeng
- Graduate Institute of Oncology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Yi-Yi Kuo
- Division of Hematology and Department of Internal Medicine, National Taiwan University, Taipei, Taiwan
| | - Chein-Jun Kao
- Division of Hematology and Department of Internal Medicine, National Taiwan University, Taipei, Taiwan
| | - Po-Han Chuang
- Division of Hematology and Department of Internal Medicine, National Taiwan University, Taipei, Taiwan
| | - Mei-Hsuan Tseng
- Division of Hematology and Department of Internal Medicine, National Taiwan University, Taipei, Taiwan
| | - Yu-Chiao Chiu
- Graduate Institute of Biomedical Electronics and Bioinformatics, National Taiwan University, Taipei, Taiwan
| | - Wen-Chien Chou
- Department of Laboratory Medicine, National Taiwan University, Taipei, Taiwan .,Division of Hematology and Department of Internal Medicine, National Taiwan University, Taipei, Taiwan
| | - Hwei-Fang Tien
- Division of Hematology and Department of Internal Medicine, National Taiwan University, Taipei, Taiwan
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35
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Sada A, Jain P, Wang S, Leung E, Tumbar T. Slc1a3-CreER as a Targeting Tool for the K6+ Epithelial Stem Cell Niche and its Precursors during Mouse Hair Follicle Cycle. J Invest Dermatol 2017; 137:1569-1571. [PMID: 28259680 DOI: 10.1016/j.jid.2017.02.974] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2016] [Revised: 02/08/2017] [Accepted: 02/08/2017] [Indexed: 10/20/2022]
Affiliation(s)
- Aiko Sada
- Department of Molecular Biology and Genetics, Cornell University, Ithaca, New York, USA; Life Science Center, Tsukuba Advanced Research Alliance, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Prachi Jain
- Department of Molecular Biology and Genetics, Cornell University, Ithaca, New York, USA
| | - Sherry Wang
- Department of Molecular Biology and Genetics, Cornell University, Ithaca, New York, USA
| | - Eva Leung
- Department of Molecular Biology and Genetics, Cornell University, Ithaca, New York, USA
| | - Tudorita Tumbar
- Department of Molecular Biology and Genetics, Cornell University, Ithaca, New York, USA.
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36
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Homeobox-Only Protein Expression Is a Critical Prognostic Indicator of Pancreatic Neuroendocrine Tumor and Is Regulated by Promoter DNA Hypermethylation. Pancreas 2016; 45:1255-1262. [PMID: 27776044 DOI: 10.1097/mpa.0000000000000646] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
OBJECTIVES We have identified homeobox-only protein (HOPX) as a tumor suppressor gene in various human cancer, and its expression was reduced by promoter DNA hypermethylation. Homeobox-only protein is strongly expressed on pancreatic islet cells; however, clinical relevance of HOPX expression has remained elusive in pancreatic neuroendocrine tumor (pNET). METHODS We investigated 36 patients with pNET who undertook surgical resection between 1988 and 2012 for HOPX expression and DNA methylation to reveal its clinical significance. RESULTS (1) Homeobox-only protein is strongly expressed on pancreatic islet cells by immunohistochemistry (IHC). Homeobox-only protein expression was recognized on pNET tumor cells for 1+ in 15, for 2+ in 16, and for 3+ in 5. (2) Homeobox-only protein IHC expression was significantly associated with prognosis (P = 0.03), and survival rate was 37.5%, 70.3%, and 100% in HOPX 1+, 2+, and 3+, respectively. (3) Promoter DNA methylation was quantitatively assessed, and HOPX hypermethylation is found in 6.3%, 11.8%, and 66.7% of G1/G2/G3 pNET, respectively (P = 0.02). (4) Multivariate Cox proportional hazards model identified HOPX IHC expression and HOPX promoter DNA hypermethylation as independent prognostic factors in pNET. CONCLUSIONS Homeobox-only protein expression is a critical prognostic indicator of pNET, and its regulation may be made through promoter DNA methylation.
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37
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Semerci F, Maletic-Savatic M. Transgenic mouse models for studying adult neurogenesis. ACTA ACUST UNITED AC 2016; 11:151-167. [PMID: 28473846 DOI: 10.1007/s11515-016-1405-3] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The mammalian hippocampus shows a remarkable capacity for continued neurogenesis throughout life. Newborn neurons, generated by the radial neural stem cells (NSCs), are important for learning and memory as well as mood control. During aging, the number and responses of NSCs to neurogenic stimuli diminish, leading to decreased neurogenesis and age-associated cognitive decline and psychiatric disorders. Thus, adult hippocampal neurogenesis has garnered significant interest because targeting it could be a novel potential therapeutic strategy for these disorders. However, if we are to use neurogenesis to halt or reverse hippocampal-related pathology, we need to understand better the core molecular machinery that governs NSC and their progeny. In this review, we summarize a wide variety of mouse models used in adult neurogenesis field, present their advantages and disadvantages based on specificity and efficiency of labeling of different cell types, and review their contribution to our understanding of the biology and the heterogeneity of different cell types found in adult neurogenic niches.
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Affiliation(s)
- Fatih Semerci
- Program in Developmental Biology, Baylor College of Medicine, Houston, TX 77030, USA.,Jan and Dan Duncan Neurological Research Institute at Texas Children's Hospital, Houston, TX 77030, USA
| | - Mirjana Maletic-Savatic
- Program in Developmental Biology, Baylor College of Medicine, Houston, TX 77030, USA.,Jan and Dan Duncan Neurological Research Institute at Texas Children's Hospital, Houston, TX 77030, USA.,Department of Pediatrics-Neurology, Department of Neuroscience, and Structural and Computational Biology and Molecular Biophysics, Baylor College of Medicine, Houston, TX 77030, USA
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38
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Mariotto A, Pavlova O, Park HS, Huber M, Hohl D. HOPX: The Unusual Homeodomain-Containing Protein. J Invest Dermatol 2016; 136:905-911. [PMID: 27017330 DOI: 10.1016/j.jid.2016.01.032] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2015] [Revised: 12/23/2015] [Accepted: 01/04/2016] [Indexed: 01/15/2023]
Abstract
The homeodomain-only protein homeobox (HOPX) is the smallest known member of the homeodomain-containing protein family, atypically unable to bind DNA. HOPX is widely expressed in diverse tissues, where it is critically involved in the regulation of proliferation and differentiation. In human skin, HOPX controls epidermal formation through the regulation of late differentiation markers, and HOPX expression correlates with the level of differentiation in cutaneous pathologies. In mouse skin, Hopx was additionally identified as a lineage tracing marker of quiescent hair follicle stem cells. This review discusses current knowledge of HOPX structure and function in normal and pathological conditions.
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Affiliation(s)
- Anita Mariotto
- Laboratory of Cutaneous Biology, Service of Dermatology and Venereology, University Hospital of Lausanne (CHUV), Lausanne, Switzerland
| | - Olesya Pavlova
- Laboratory of Cutaneous Biology, Service of Dermatology and Venereology, University Hospital of Lausanne (CHUV), Lausanne, Switzerland
| | - Hyun-Sook Park
- Laboratory of Cutaneous Biology, Service of Dermatology and Venereology, University Hospital of Lausanne (CHUV), Lausanne, Switzerland
| | - Marcel Huber
- Laboratory of Cutaneous Biology, Service of Dermatology and Venereology, University Hospital of Lausanne (CHUV), Lausanne, Switzerland
| | - Daniel Hohl
- Laboratory of Cutaneous Biology, Service of Dermatology and Venereology, University Hospital of Lausanne (CHUV), Lausanne, Switzerland.
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39
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Isolation and Fluorescence-Activated Cell Sorting of Mouse Keratinocytes Expressing β-Galactosidase. Methods Mol Biol 2016; 1453:123-36. [PMID: 27431252 DOI: 10.1007/978-1-4939-3786-8_13] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
During the past decade, the rapid development of new transgenic and knock-in mouse models has propelled epidermal stem-cell research into "fast-forward mode". It has become possible to identify and visualize defined cell populations during normal tissue maintenance, and to follow their progeny during the processes of homeostasis, wound repair, and tumorigenesis. Moreover, these cells can be isolated using specific labels, and characterized in detail using an array of molecular and cell biology approaches. The bacterial enzyme, β-galactosidase (β-gal), the product of the LacZ gene, is one of the most commonly used in vivo cell labels in genetically-engineered mice. The protocol described in this chapter provides a guideline for the isolation of viable murine epidermal cells expressing β-gal, which can then be subjected to further characterization in vivo or in vitro.
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40
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Fixed single-cell transcriptomic characterization of human radial glial diversity. Nat Methods 2015; 13:87-93. [PMID: 26524239 PMCID: PMC4869711 DOI: 10.1038/nmeth.3629] [Citation(s) in RCA: 167] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Accepted: 09/23/2015] [Indexed: 01/13/2023]
Abstract
The human neocortex is created from diverse intermixed progenitors in the prenatal germinal zones. These progenitors have been difficult to characterize since progenitors—particularly radial glia (RG)—are rare, and are defined by a combination of intracellular markers, position and morphology. To circumvent these problems we developed a method called FRISCR for transcriptome profiling of individual fixed, stained and sorted cells. After validation of FRISCR using human embryonic stem cells, we profiled primary human RG that constitute only 1% of the mid-gestation cortex. These RG could be classified into ventricular zone-enriched RG (vRG) that express ANXA1 and CRYAB, and outer subventricular zone-localized RG (oRG) that express HOPX. Our study identifies the first markers and molecular profiles of vRG and oRG cells, and provides an essential step for understanding molecular networks driving the lineage of human neocortical progenitors. Furthermore, FRISCR allows targeted single-cell transcriptomic profiling of tissues that lack live-cell markers.
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41
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Geyfman M, Plikus MV, Treffeisen E, Andersen B, Paus R. Resting no more: re-defining telogen, the maintenance stage of the hair growth cycle. Biol Rev Camb Philos Soc 2015; 90:1179-96. [PMID: 25410793 PMCID: PMC4437968 DOI: 10.1111/brv.12151] [Citation(s) in RCA: 96] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2013] [Revised: 09/12/2014] [Accepted: 10/07/2014] [Indexed: 12/17/2022]
Abstract
The hair follicle (HF) represents a prototypic ectodermal-mesodermal interaction system in which central questions of modern biology can be studied. A unique feature of these stem-cell-rich mini-organs is that they undergo life-long, cyclic transformations between stages of active regeneration (anagen), apoptotic involution (catagen), and relative proliferative quiescence (telogen). Due to the low proliferation rate and small size of the HF during telogen, this stage was conventionally thought of as a stage of dormancy. However, multiple lines of newly emerging evidence show that HFs during telogen are anything but dormant. Here, we emphasize that telogen is a highly energy-efficient default state of the mammalian coat, whose function centres around maintenance of the hair fibre and prompt responses to its loss. While actively retaining hair fibres with minimal energy expenditure, telogen HFs can launch a new regeneration cycle in response to a variety of stimuli originating in their autonomous micro-environment (including its stem cell niche) as well as in their external tissue macro-environment. Regenerative responses of telogen HFs change as a function of time and can be divided into two sub-stages: early 'refractory' and late 'competent' telogen. These changing activities are reflected in hundreds of dynamically regulated genes in telogen skin, possibly aimed at establishing a fast response-signalling environment to trauma and other disturbances of skin homeostasis. Furthermore, telogen is an interpreter of circadian output in the timing of anagen initiation and the key stage during which the subsequent organ regeneration (anagen) is actively prepared by suppressing molecular brakes on hair growth while activating pro-regenerative signals. Thus, telogen may serve as an excellent model system for dissecting signalling and cellular interactions that precede the active 'regenerative mode' of tissue remodeling. This revised understanding of telogen biology also points to intriguing new therapeutic avenues in the management of common human hair growth disorders.
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Affiliation(s)
- Mikhail Geyfman
- Department of Ophthalmology, University of California, Irvine, CA 92697, USA
| | - Maksim V. Plikus
- Department of Developmental and Cell Biology, Sue and Bill Gross Stem Cell Research Center, University of California, Irvine, CA 92697, USA
| | - Elsa Treffeisen
- Department of Dermatology, Kligman Labouratories, University of Pennsylvania School of Medicine, Philadelphia, PA 19104, USA
| | - Bogi Andersen
- Department of Biological Chemistry, University of California Irvine, CA 92697, USA
- Department of Medicine, University of California Irvine, CA 92697, USA
- Institute for Genomics and Bioinformatics, University of California, Irvine, CA 92697, USA
| | - Ralf Paus
- Department of Dermatology, University of Luebeck, Luebeck, Germany
- Institute of Inflammation and Repair, and Dermatology Centre, University of Manchester, Stopford Building, Oxford Road, Manchester M13 9PL, UK
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42
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Li D, Takeda N, Jain R, Manderfield LJ, Liu F, Li L, Anderson SA, Epstein JA. Hopx distinguishes hippocampal from lateral ventricle neural stem cells. Stem Cell Res 2015; 15:522-529. [PMID: 26451648 DOI: 10.1016/j.scr.2015.09.015] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Revised: 09/17/2015] [Accepted: 09/29/2015] [Indexed: 01/09/2023] Open
Abstract
In the adult dentate gyrus (DG) and in the proliferative zone lining the lateral ventricle (LV-PZ), radial glia-like (RGL) cells are neural stem cells (NSCs) that generate granule neurons. A number of molecular markers including glial fibrillary acidic protein (GFAP), Sox2 and nestin, can identify quiescent NSCs in these two niches. However, to date, there is no marker that distinguishes NSC origin of DG versus LV-PZ. Hopx, an atypical homeodomain only protein, is expressed by adult stem cell populations including those in the intestine and hair follicle. Here, we show that Hopx is specifically expressed in RGL cells in the adult DG, and these cells give rise to granule neurons. Assessed by non-stereological quantitation, Hopx-null NSCs exhibit enhanced neurogenesis evident by an increased number of BrdU-positive cells and doublecortin (DCX)-positive neuroblasts. In contrast, Sox2-positive, quiescent NSCs are reduced in the DG of Hopx-null animals and Notch signaling is reduced, as evidenced by reduced expression of Notch targets Hes1 and Hey2, and a reduction of the number of cells expressing the cleaved, activated form of the Notch1 receptor, the Notch intracellular domain (NICD) in Hopx-null DG. Surprisingly, Hopx is not expressed in RGL cells of the adult LV-PZ, and Hopx-expressing cells do not give rise to interneurons of the olfactory bulb (OB). These findings establish that Hopx expression distinguishes NSCs of the DG from those of the LV-PZ, and suggest that Hopx potentially regulates hippocampal neurogenesis by modulating Notch signaling.
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Affiliation(s)
- Deqiang Li
- Department of Cell and Developmental Biology, Cardiovascular Institute, Institute for Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Norifumi Takeda
- Department of Cell and Developmental Biology, Cardiovascular Institute, Institute for Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Rajan Jain
- Department of Cell and Developmental Biology, Cardiovascular Institute, Institute for Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Lauren J Manderfield
- Department of Cell and Developmental Biology, Cardiovascular Institute, Institute for Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Feiyan Liu
- Department of Cell and Developmental Biology, Cardiovascular Institute, Institute for Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Li Li
- Department of Cell and Developmental Biology, Cardiovascular Institute, Institute for Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Stewart A Anderson
- Department of Psychiatry, Children's Hospital of Philadelphia, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA.
| | - Jonathan A Epstein
- Department of Cell and Developmental Biology, Cardiovascular Institute, Institute for Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA.
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43
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Jain R, Li D, Gupta M, Manderfield LJ, Ifkovits JL, Wang Q, Liu F, Liu Y, Poleshko A, Padmanabhan A, Raum JC, Li L, Morrisey EE, Lu MM, Won KJ, Epstein JA. HEART DEVELOPMENT. Integration of Bmp and Wnt signaling by Hopx specifies commitment of cardiomyoblasts. Science 2015; 348:aaa6071. [PMID: 26113728 DOI: 10.1126/science.aaa6071] [Citation(s) in RCA: 104] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Cardiac progenitor cells are multipotent and give rise to cardiac endothelium, smooth muscle, and cardiomyocytes. Here, we define and characterize the cardiomyoblast intermediate that is committed to the cardiomyocyte fate, and we characterize the niche signals that regulate commitment. Cardiomyoblasts express Hopx, which functions to coordinate local Bmp signals to inhibit the Wnt pathway, thus promoting cardiomyogenesis. Hopx integrates Bmp and Wnt signaling by physically interacting with activated Smads and repressing Wnt genes. The identification of the committed cardiomyoblast that retains proliferative potential will inform cardiac regenerative therapeutics. In addition, Bmp signals characterize adult stem cell niches in other tissues where Hopx-mediated inhibition of Wnt is likely to contribute to stem cell quiescence and to explain the role of Hopx as a tumor suppressor.
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Affiliation(s)
- Rajan Jain
- Department of Cell and Developmental Biology, Penn Cardiovascular Institute, Institute of Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Deqiang Li
- Department of Cell and Developmental Biology, Penn Cardiovascular Institute, Institute of Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Mudit Gupta
- Department of Cell and Developmental Biology, Penn Cardiovascular Institute, Institute of Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Lauren J Manderfield
- Department of Cell and Developmental Biology, Penn Cardiovascular Institute, Institute of Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Jamie L Ifkovits
- Department of Cell and Developmental Biology, Penn Cardiovascular Institute, Institute of Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Qiaohong Wang
- Department of Cell and Developmental Biology, Penn Cardiovascular Institute, Institute of Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Feiyan Liu
- Department of Cell and Developmental Biology, Penn Cardiovascular Institute, Institute of Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Ying Liu
- Department of Cell and Developmental Biology, Penn Cardiovascular Institute, Institute of Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Andrey Poleshko
- Department of Cell and Developmental Biology, Penn Cardiovascular Institute, Institute of Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Arun Padmanabhan
- Department of Cell and Developmental Biology, Penn Cardiovascular Institute, Institute of Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Jeffrey C Raum
- Department of Genetics, Institute for Diabetes, Obesity, and Metabolism, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Li Li
- Department of Cell and Developmental Biology, Penn Cardiovascular Institute, Institute of Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Edward E Morrisey
- Department of Cell and Developmental Biology, Penn Cardiovascular Institute, Institute of Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Min Min Lu
- Department of Cell and Developmental Biology, Penn Cardiovascular Institute, Institute of Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Kyoung-Jae Won
- Department of Genetics, Institute for Diabetes, Obesity, and Metabolism, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Jonathan A Epstein
- Department of Cell and Developmental Biology, Penn Cardiovascular Institute, Institute of Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA.
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Jones A, Opejin A, Henderson JG, Gross C, Jain R, Epstein JA, Flavell RA, Hawiger D. Peripherally Induced Tolerance Depends on Peripheral Regulatory T Cells That Require Hopx To Inhibit Intrinsic IL-2 Expression. THE JOURNAL OF IMMUNOLOGY 2015; 195:1489-97. [PMID: 26170384 DOI: 10.4049/jimmunol.1500174] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Accepted: 06/15/2015] [Indexed: 01/10/2023]
Abstract
Dendritic cells (DCs) can induce peripheral immune tolerance that prevents autoimmune responses. Ag presentation by peripheral DCs under steady-state conditions leads to a conversion of some peripheral CD4(+) T cells into regulatory T cells (Tregs) that require homeodomain-only protein (Hopx) to mediate T cell unresponsiveness. However, the roles of these peripheral Tregs (pTregs) in averting autoimmune responses, as well as immunological mechanisms of Hopx, remain unknown. We report that Hopx(+) pTregs converted by DCs from Hopx(-) T cells are indispensible to sustain tolerance that prevents autoimmune responses directed at self-Ags during experimental acute encephalomyelitis. Our studies further reveal that Hopx inhibits intrinsic IL-2 expression in pTregs after antigenic rechallenge. In the absence of Hopx, increased levels of IL-2 lead to death and decreased numbers of pTregs. Therefore, formation of Hopx(+) pTregs represents a crucial pathway of sustained tolerance induced by peripheral DCs, and the maintenance of such pTregs and tolerance requires functions of Hopx to block intrinsic IL-2 production in pTregs.
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Affiliation(s)
- Andrew Jones
- Department of Molecular Microbiology and Immunology, Saint Louis University School of Medicine, St. Louis, MO 63104
| | - Adeleye Opejin
- Department of Molecular Microbiology and Immunology, Saint Louis University School of Medicine, St. Louis, MO 63104
| | - Jacob G Henderson
- Department of Molecular Microbiology and Immunology, Saint Louis University School of Medicine, St. Louis, MO 63104
| | - Cindy Gross
- Department of Molecular Microbiology and Immunology, Saint Louis University School of Medicine, St. Louis, MO 63104
| | - Rajan Jain
- Department of Cell and Developmental Biology and Institute for Regenerative Medicine and Cardiovascular Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104; and
| | - Jonathan A Epstein
- Department of Cell and Developmental Biology and Institute for Regenerative Medicine and Cardiovascular Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104; and
| | - Richard A Flavell
- Department of Immunobiology and Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, CT 06519
| | - Daniel Hawiger
- Department of Molecular Microbiology and Immunology, Saint Louis University School of Medicine, St. Louis, MO 63104;
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Zhou X, Crow AL, Hartiala J, Spindler TJ, Ghazalpour A, Barsky LW, Bennett BJ, Parks BW, Eskin E, Jain R, Epstein JA, Lusis AJ, Adams GB, Allayee H. The Genetic Landscape of Hematopoietic Stem Cell Frequency in Mice. Stem Cell Reports 2015; 5:125-38. [PMID: 26050929 PMCID: PMC4618249 DOI: 10.1016/j.stemcr.2015.05.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Revised: 05/07/2015] [Accepted: 05/08/2015] [Indexed: 12/31/2022] Open
Abstract
Prior efforts to identify regulators of hematopoietic stem cell physiology have relied mainly on candidate gene approaches with genetically modified mice. Here we used a genome-wide association study (GWAS) strategy with the hybrid mouse diversity panel to identify the genetic determinants of hematopoietic stem/progenitor cell (HSPC) frequency. Among 108 strains, we observed ∼120- to 300-fold variation in three HSPC populations. A GWAS analysis identified several loci that were significantly associated with HSPC frequency, including a locus on chromosome 5 harboring the homeodomain-only protein gene (Hopx). Hopx previously had been implicated in cardiac development but was not known to influence HSPC biology. Analysis of the HSPC pool in Hopx−/− mice demonstrated significantly reduced cell frequencies and impaired engraftment in competitive repopulation assays, thus providing functional validation of this positional candidate gene. These results demonstrate the power of GWAS in mice to identify genetic determinants of the hematopoietic system. Genetic variation across mouse strains influences hematopoietic stem cell frequency This variation can be exploited for genome-wide association studies Hopx is a regulator of hematopoietic stem/progenitor cell function This approach can be used to identify genetic determinants of other stem cell systems
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Affiliation(s)
- Xiaoying Zhou
- Eli and Edythe Broad Center for Regenerative Medicine and Stem Cell Research at USC, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA
| | - Amanda L Crow
- Department of Preventive Medicine and Institute for Genetic Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA
| | - Jaana Hartiala
- Department of Preventive Medicine and Institute for Genetic Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA
| | - Tassja J Spindler
- Eli and Edythe Broad Center for Regenerative Medicine and Stem Cell Research at USC, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA
| | - Anatole Ghazalpour
- Departments of Human Genetics, Medicine, and Microbiology, Immunology, and Molecular Genetics, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA
| | - Lora W Barsky
- Eli and Edythe Broad Center for Regenerative Medicine and Stem Cell Research at USC, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA
| | - Brian J Bennett
- Department of Genetics and Nutrition Research Institute, University of North Carolina, Chapel Hill, Kannapolis, NC 28081, USA
| | - Brian W Parks
- Departments of Human Genetics, Medicine, and Microbiology, Immunology, and Molecular Genetics, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA
| | - Eleazar Eskin
- Department of Computer Science and Inter-Departmental Program in Bioinformatics, University of California, Los Angeles, Los Angeles, CA 90095, USA
| | - Rajan Jain
- Department of Cell and Developmental Biology and Penn Cardiovascular Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Jonathan A Epstein
- Department of Cell and Developmental Biology and Penn Cardiovascular Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Aldons J Lusis
- Departments of Human Genetics, Medicine, and Microbiology, Immunology, and Molecular Genetics, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095, USA
| | - Gregor B Adams
- Eli and Edythe Broad Center for Regenerative Medicine and Stem Cell Research at USC, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA.
| | - Hooman Allayee
- Department of Preventive Medicine and Institute for Genetic Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA.
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46
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Norum JH, Bergström Å, Andersson AB, Kuiper RV, Hoelzl MA, Sørlie T, Toftgård R. A conditional transgenic mouse line for targeted expression of the stem cell marker LGR5. Dev Biol 2015; 404:35-48. [PMID: 26003047 DOI: 10.1016/j.ydbio.2015.05.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2014] [Revised: 04/04/2015] [Accepted: 05/01/2015] [Indexed: 12/12/2022]
Abstract
LGR5 is a known marker of embryonic and adult stem cells in several tissues. In a mouse model, Lgr5+ cells have shown tumour-initiating properties, while in human cancers, such as basal cell carcinoma and colon cancer, LGR5 expression levels are increased: however, the effect of increased LGR5 expression is not fully understood. To study the effects of elevated LGR5 expression levels we generated a novel tetracycline-responsive, conditional transgenic mouse line expressing human LGR5, designated TRELGR5. In this transgenic line, LGR5 expression can be induced in any tissue depending on the expression pattern of the chosen transcriptional regulator. For the current study, we used transgenic mice with a tetracycline-regulated transcriptional transactivator linked to the bovine keratin 5 promoter (K5tTA) to drive expression of LGR5 in the epidermis. As expected, expression of human LGR5 was induced in the skin of double transgenic mice (K5tTA;TRELGR5). Inducing LGR5 expression during embryogenesis and early development resulted in macroscopically and microscopically detectable phenotypic changes, including kink tail, sparse fur coat and enlarged sebaceous glands. The fur and sebaceous gland phenotypes were reversible upon discontinued expression of transgenic LGR5, but this was not observed for the kink tail phenotype. There were no apparent phenotypic changes if LGR5 expression was induced at three weeks of age. The results demonstrate that increased expression of LGR5 during embryogenesis and the neonatal period alter skin development and homeostasis.
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Affiliation(s)
- Jens Henrik Norum
- Center for Innovative Medicine and Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge, Sweden; Department of Genetics and Cancer Stem Cell Innovation Centre, Institute for Cancer Research, Oslo University Hospital, Norwegian Radium Hospital, Oslo, Norway.
| | - Åsa Bergström
- Center for Innovative Medicine and Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge, Sweden
| | - Agneta Birgitta Andersson
- Center for Innovative Medicine and Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge, Sweden
| | - Raoul V Kuiper
- Department of Laboratory Medicine, Karolinska Institutet, Huddinge, Sweden
| | - Maria A Hoelzl
- Center for Innovative Medicine and Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge, Sweden
| | - Therese Sørlie
- Department of Genetics and Cancer Stem Cell Innovation Centre, Institute for Cancer Research, Oslo University Hospital, Norwegian Radium Hospital, Oslo, Norway
| | - Rune Toftgård
- Center for Innovative Medicine and Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge, Sweden
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47
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Jain R, Barkauskas CE, Takeda N, Bowie EJ, Aghajanian H, Wang Q, Padmanabhan A, Manderfield LJ, Gupta M, Li D, Li L, Trivedi CM, Hogan BLM, Epstein JA. Plasticity of Hopx(+) type I alveolar cells to regenerate type II cells in the lung. Nat Commun 2015; 6:6727. [PMID: 25865356 PMCID: PMC4396689 DOI: 10.1038/ncomms7727] [Citation(s) in RCA: 209] [Impact Index Per Article: 23.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2014] [Accepted: 02/23/2015] [Indexed: 12/22/2022] Open
Abstract
The plasticity of differentiated cells in adult tissues undergoing repair is an area of intense research. Pulmonary alveolar type II cells produce surfactant and function as progenitors in the adult, demonstrating both self-renewal and differentiation into gas exchanging type I cells. In vivo, type I cells are thought to be terminally differentiated and their ability to give rise to alternate lineages has not been reported. Here we show that Hopx becomes restricted to type I cells during development. However, unexpectedly, lineage-labelled Hopx(+) cells both proliferate and generate type II cells during adult alveolar regrowth following partial pneumonectomy. In clonal 3D culture, single Hopx(+) type I cells generate organoids composed of type I and type II cells, a process modulated by TGFβ signalling. These findings demonstrate unanticipated plasticity of type I cells and a bidirectional lineage relationship between distinct differentiated alveolar epithelial cell types in vivo and in single-cell culture.
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Affiliation(s)
- Rajan Jain
- Department of Cell and Developmental Biology, Penn Cardiovascular Institute, Institute of Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Christina E Barkauskas
- Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Medicine, Duke Medicine, Durham, North Carolina 27710, USA
| | - Norifumi Takeda
- Department of Cell and Developmental Biology, Penn Cardiovascular Institute, Institute of Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Emily J Bowie
- Department of Cell Biology, Duke Medicine, Durham, North Carolina 27710, USA
| | - Haig Aghajanian
- Department of Cell and Developmental Biology, Penn Cardiovascular Institute, Institute of Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Qiaohong Wang
- Department of Cell and Developmental Biology, Penn Cardiovascular Institute, Institute of Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Arun Padmanabhan
- Department of Cell and Developmental Biology, Penn Cardiovascular Institute, Institute of Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Lauren J Manderfield
- Department of Cell and Developmental Biology, Penn Cardiovascular Institute, Institute of Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Mudit Gupta
- Department of Cell and Developmental Biology, Penn Cardiovascular Institute, Institute of Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Deqiang Li
- Department of Cell and Developmental Biology, Penn Cardiovascular Institute, Institute of Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Li Li
- Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Medicine, Duke Medicine, Durham, North Carolina 27710, USA
| | - Chinmay M Trivedi
- Department of Cell and Developmental Biology, Penn Cardiovascular Institute, Institute of Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Brigid L M Hogan
- Department of Cell Biology, Duke Medicine, Durham, North Carolina 27710, USA
| | - Jonathan A Epstein
- Department of Cell and Developmental Biology, Penn Cardiovascular Institute, Institute of Regenerative Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
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48
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Hilmi ABM, Halim AS. Vital roles of stem cells and biomaterials in skin tissue engineering. World J Stem Cells 2015; 7:428-436. [PMID: 25815126 PMCID: PMC4369498 DOI: 10.4252/wjsc.v7.i2.428] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Revised: 09/29/2014] [Accepted: 10/27/2014] [Indexed: 02/06/2023] Open
Abstract
Tissue engineering essentially refers to technology for growing new human tissue and is distinct from regenerative medicine. Currently, pieces of skin are already being fabricated for clinical use and many other tissue types may be fabricated in the future. Tissue engineering was first defined in 1987 by the United States National Science Foundation which critically discussed the future targets of bioengineering research and its consequences. The principles of tissue engineering are to initiate cell cultures in vitro, grow them on scaffolds in situ and transplant the composite into a recipient in vivo. From the beginning, scaffolds have been necessary in tissue engineering applications. Regardless, the latest technology has redirected established approaches by omitting scaffolds. Currently, scientists from diverse research institutes are engineering skin without scaffolds. Due to their advantageous properties, stem cells have robustly transformed the tissue engineering field as part of an engineered bilayered skin substitute that will later be discussed in detail. Additionally, utilizing biomaterials or skin replacement products in skin tissue engineering as strategy to successfully direct cell proliferation and differentiation as well as to optimize the safety of handling during grafting is beneficial. This approach has also led to the cells’ application in developing the novel skin substitute that will be briefly explained in this review.
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49
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Chen Y, Yang L, Cui T, Pacyna-Gengelbach M, Petersen I. HOPX is methylated and exerts tumour-suppressive function through Ras-induced senescence in human lung cancer. J Pathol 2014; 235:397-407. [DOI: 10.1002/path.4469] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2013] [Revised: 09/24/2014] [Accepted: 10/10/2014] [Indexed: 11/08/2022]
Affiliation(s)
- Yuan Chen
- Institute of Pathology, University Hospital Jena; Friedrich-Schiller-University Jena; Ziegelmühlenweg 1 07743 Jena Germany
| | - Linlin Yang
- Institute of Pathology, University Hospital Jena; Friedrich-Schiller-University Jena; Ziegelmühlenweg 1 07743 Jena Germany
| | - Tiantian Cui
- Institute of Pathology, University Hospital Jena; Friedrich-Schiller-University Jena; Ziegelmühlenweg 1 07743 Jena Germany
| | | | - Iver Petersen
- Institute of Pathology, University Hospital Jena; Friedrich-Schiller-University Jena; Ziegelmühlenweg 1 07743 Jena Germany
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50
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Single-cell analysis of proxy reporter allele-marked epithelial cells establishes intestinal stem cell hierarchy. Stem Cell Reports 2014; 3:876-91. [PMID: 25418730 PMCID: PMC4235148 DOI: 10.1016/j.stemcr.2014.09.011] [Citation(s) in RCA: 87] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Revised: 09/10/2014] [Accepted: 09/11/2014] [Indexed: 01/17/2023] Open
Abstract
The recent development of targeted murine reporter alleles as proxies for intestinal stem cell activity has led to significant advances in our understanding of somatic stem cell hierarchies and dynamics. Analysis of these reporters has led to a model in which an indispensable reserve stem cell at the top of the hierarchy (marked by Bmi1 and Hopx reporters) gives rise to active intestinal stem cells (marked by an Lgr5 reporter). Despite these advances, controversy exists regarding the specificity and fidelity with which these alleles distinguish intestinal stem cell populations. Here, we undertake a comprehensive comparison of widely used proxy reporters including both CreERT2 and EGFP cassettes targeted to the Lgr5, Bmi1, and Hopx loci. Single-cell transcriptional profiling of these populations and their progeny reveals that reserve and active intestinal stem cells are molecularly and functionally distinct, supporting a two-stem-cell model for intestinal self-renewal. Proxy intestinal stem cell reporter alleles often mark heterogeneous populations Discrepancies exist between proxy reporter activity and endogenous transcripts Reserve and active intestinal stem cells are molecularly distinct Reserve intestinal stem cells give rise to active stem cells during homeostasis
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